MP3Extractor.cpp revision b64af9a221c1df4853ab7c7766d5f956c61b8765
1e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber/* 2e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * Copyright (C) 2009 The Android Open Source Project 3e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * 4e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 5e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * you may not use this file except in compliance with the License. 6e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * You may obtain a copy of the License at 7e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * 8e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 9e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * 10e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * Unless required by applicable law or agreed to in writing, software 11e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 12e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * See the License for the specific language governing permissions and 14e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber * limitations under the License. 15e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber */ 16e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 17e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber//#define LOG_NDEBUG 0 18e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#define LOG_TAG "MP3Extractor" 19e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <utils/Log.h> 20e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2157515f334bcc1f66f95e342bfcaa13bf9ca802adAndreas Huber#include "include/MP3Extractor.h" 2257515f334bcc1f66f95e342bfcaa13bf9ca802adAndreas Huber 23aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber#include "include/ID3.h" 24aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 25e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/DataSource.h> 26e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaBuffer.h> 27e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaBufferGroup.h> 28b5ceb9ee21f37ae0817c16490c1fc148dd3eb5e2Andreas Huber#include <media/stagefright/MediaDebug.h> 29e6c409632f773e41f33188272a0072be9fcb783fAndreas Huber#include <media/stagefright/MediaDefs.h> 30e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaErrors.h> 31e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaSource.h> 32e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MetaData.h> 33e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/Utils.h> 34e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <utils/String8.h> 35e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 36e46b7be812d68e49710b34048662cbf18e2a6550Andreas Hubernamespace android { 37e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 38b16e5543713cc557bdc7ceef7c0a5a8b61f3232dAndreas Huber// Everything must match except for 391d200e3b959f7562b21a6e9d94910ddd051cfe10Andreas Huber// protection, bitrate, padding, private bits, mode extension, 401d200e3b959f7562b21a6e9d94910ddd051cfe10Andreas Huber// copyright bit, original bit and emphasis. 411d200e3b959f7562b21a6e9d94910ddd051cfe10Andreas Huber// Yes ... there are things that must indeed match... 421d200e3b959f7562b21a6e9d94910ddd051cfe10Andreas Huberstatic const uint32_t kMask = 0xfffe0cc0; 43b16e5543713cc557bdc7ceef7c0a5a8b61f3232dAndreas Huber 44e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatic bool get_mp3_frame_size( 45e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header, size_t *frame_size, 46e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int *out_sampling_rate = NULL, int *out_channels = NULL, 47e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int *out_bitrate = NULL) { 48e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *frame_size = 0; 49e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 50e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_sampling_rate) { 51e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_sampling_rate = 0; 52e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 53e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 54e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_channels) { 55e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_channels = 0; 56e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 57e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 58e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_bitrate) { 59e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_bitrate = 0; 60e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 61e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 62e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if ((header & 0xffe00000) != 0xffe00000) { 63e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 64e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 65e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 66e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned version = (header >> 19) & 3; 67e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 68e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (version == 0x01) { 69e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 70e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 71b16e5543713cc557bdc7ceef7c0a5a8b61f3232dAndreas Huber 72e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned layer = (header >> 17) & 3; 73e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 74e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (layer == 0x00) { 75e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 76e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 77e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 78e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned protection = (header >> 16) & 1; 79e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 80e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned bitrate_index = (header >> 12) & 0x0f; 81e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 82e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (bitrate_index == 0 || bitrate_index == 0x0f) { 83e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Disallow "free" bitrate. 84e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 85e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 86e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 87e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned sampling_rate_index = (header >> 10) & 3; 88e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 89e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (sampling_rate_index == 3) { 90e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 91e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 92e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 93e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kSamplingRateV1[] = { 44100, 48000, 32000 }; 94e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int sampling_rate = kSamplingRateV1[sampling_rate_index]; 95e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (version == 2 /* V2 */) { 96e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber sampling_rate /= 2; 97e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else if (version == 0 /* V2.5 */) { 98e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber sampling_rate /= 4; 99e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 100e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 101e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned padding = (header >> 9) & 1; 102e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 103e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (layer == 3) { 104e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // layer I 105e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 106e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV1[] = { 107e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 64, 96, 128, 160, 192, 224, 256, 108e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 288, 320, 352, 384, 416, 448 109e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 110e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 111e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV2[] = { 112e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 48, 56, 64, 80, 96, 112, 128, 113e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 144, 160, 176, 192, 224, 256 114e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 115e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 116e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int bitrate = 117e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber (version == 3 /* V1 */) 118e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ? kBitrateV1[bitrate_index - 1] 119e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : kBitrateV2[bitrate_index - 1]; 120e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 121e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_bitrate) { 122e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_bitrate = bitrate; 123e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 124e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 125e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *frame_size = (12000 * bitrate / sampling_rate + padding) * 4; 126e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else { 127e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // layer II or III 128e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 129e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV1L2[] = { 130e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 48, 56, 64, 80, 96, 112, 128, 131e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 160, 192, 224, 256, 320, 384 132e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 133e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 134e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV1L3[] = { 135e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 40, 48, 56, 64, 80, 96, 112, 136e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 128, 160, 192, 224, 256, 320 137e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 138e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 139e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV2[] = { 140e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 8, 16, 24, 32, 40, 48, 56, 64, 141e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 80, 96, 112, 128, 144, 160 142e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 143e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 144e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int bitrate; 145e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (version == 3 /* V1 */) { 146e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bitrate = (layer == 2 /* L2 */) 147e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ? kBitrateV1L2[bitrate_index - 1] 148e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : kBitrateV1L3[bitrate_index - 1]; 149e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else { 150e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // V2 (or 2.5) 151e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 152e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bitrate = kBitrateV2[bitrate_index - 1]; 153e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 154e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 155e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_bitrate) { 156e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_bitrate = bitrate; 157e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 158e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 15963f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber if (version == 3 /* V1 */) { 16063f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber *frame_size = 144000 * bitrate / sampling_rate + padding; 16163f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber } else { 16263f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber // V2 or V2.5 16363f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber *frame_size = 72000 * bitrate / sampling_rate + padding; 16463f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber } 165e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 166e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 167e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_sampling_rate) { 168e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_sampling_rate = sampling_rate; 169e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 170e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 171e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_channels) { 172e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int channel_mode = (header >> 6) & 3; 173e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 174e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_channels = (channel_mode == 3) ? 1 : 2; 175e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 176e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 177e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return true; 178e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 179e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 1801ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wangstatic bool parse_xing_header( 1811ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang const sp<DataSource> &source, off_t first_frame_pos, 1821ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int32_t *frame_number = NULL, int32_t *byte_number = NULL, 1831ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang char *table_of_contents = NULL, int32_t *quality_indicator = NULL, 1841ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int64_t *duration = NULL) { 1851ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 1861ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (frame_number) { 1871ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *frame_number = 0; 1881ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 1891ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (byte_number) { 1901ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *byte_number = 0; 1911ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 1921ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (table_of_contents) { 1931ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang table_of_contents[0] = 0; 1941ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 1951ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (quality_indicator) { 1961ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *quality_indicator = 0; 1971ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 1981ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (duration) { 1991ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *duration = 0; 2001ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2011ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 2021ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang uint8_t buffer[4]; 2031ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int offset = first_frame_pos; 2041ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (source->readAt(offset, &buffer, 4) < 4) { // get header 2051ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2061ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2071ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang offset += 4; 2081ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 2091ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang uint8_t id, layer, sr_index, mode; 2101ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang layer = (buffer[1] >> 1) & 3; 2111ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang id = (buffer[1] >> 3) & 3; 2121ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang sr_index = (buffer[2] >> 2) & 3; 2131ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mode = (buffer[3] >> 6) & 3; 2141ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (layer == 0) { 2151ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2161ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2171ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (id == 1) { 2181ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2191ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2201ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (sr_index == 3) { 2211ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2221ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2231ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang // determine offset of XING header 2241ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if(id&1) { // mpeg1 2251ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (mode != 3) offset += 32; 2261ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang else offset += 17; 2271ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } else { // mpeg2 2281ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (mode != 3) offset += 17; 2291ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang else offset += 9; 2301ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2311ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 2321ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (source->readAt(offset, &buffer, 4) < 4) { // XING header ID 2331ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2341ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2351ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang offset += 4; 2361ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang // Check XING ID 2371ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if ((buffer[0] != 'X') || (buffer[1] != 'i') 2381ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang || (buffer[2] != 'n') || (buffer[3] != 'g')) { 2391ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if ((buffer[0] != 'I') || (buffer[1] != 'n') 2401ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang || (buffer[2] != 'f') || (buffer[3] != 'o')) { 2411ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2421ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2431ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2441ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 2451ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (source->readAt(offset, &buffer, 4) < 4) { // flags 2461ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2471ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2481ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang offset += 4; 2491ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang uint32_t flags = U32_AT(buffer); 2501ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 2511ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (flags & 0x0001) { // Frames field is present 2521ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (source->readAt(offset, buffer, 4) < 4) { 2531ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2541ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2551ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (frame_number) { 2561ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *frame_number = U32_AT(buffer); 2571ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2581ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int32_t frame = U32_AT(buffer); 2591ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang // Samples per Frame: 1. index = MPEG Version ID, 2. index = Layer 2601ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang const int samplesPerFrames[2][3] = 2611ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 2621ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 384, 1152, 576 }, // MPEG 2, 2.5: layer1, layer2, layer3 2631ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 384, 1152, 1152 }, // MPEG 1: layer1, layer2, layer3 2641ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang }; 2651ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang // sampling rates in hertz: 1. index = MPEG Version ID, 2. index = sampling rate index 2661ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang const int samplingRates[4][3] = 2671ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 2681ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 11025, 12000, 8000, }, // MPEG 2.5 2691ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 0, 0, 0, }, // reserved 2701ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 22050, 24000, 16000, }, // MPEG 2 2711ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang { 44100, 48000, 32000, } // MPEG 1 2721ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang }; 2731ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (duration) { 2741ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *duration = (int64_t)frame * samplesPerFrames[id&1][3-layer] * 1000000LL 2751ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang / samplingRates[id][sr_index]; 2761ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2771ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang offset += 4; 2781ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2791ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (flags & 0x0002) { // Bytes field is present 2801ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (byte_number) { 2811ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (source->readAt(offset, buffer, 4) < 4) { 2821ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2831ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2841ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *byte_number = U32_AT(buffer); 2851ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2861ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang offset += 4; 2871ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2881ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (flags & 0x0004) { // TOC field is present 2891ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (table_of_contents) { 2901ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (source->readAt(offset + 1, table_of_contents, 99) < 99) { 2911ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 2921ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2931ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2941ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang offset += 100; 2951ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 2961ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (flags & 0x0008) { // Quality indicator field is present 2971ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (quality_indicator) { 2981ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (source->readAt(offset, buffer, 4) < 4) { 2991ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return false; 3001ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 3011ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang *quality_indicator = U32_AT(buffer); 3021ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 3031ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 3041ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang return true; 3051ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang} 3061ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 307e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatic bool Resync( 308be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber const sp<DataSource> &source, uint32_t match_header, 309e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t *inout_pos, uint32_t *out_header) { 31063f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber if (*inout_pos == 0) { 31163f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber // Skip an optional ID3 header if syncing at the very beginning 31263f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber // of the datasource. 31363f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber 3140d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber for (;;) { 3150d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber uint8_t id3header[10]; 3160d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber if (source->readAt(*inout_pos, id3header, sizeof(id3header)) 3170d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber < (ssize_t)sizeof(id3header)) { 3180d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber // If we can't even read these 10 bytes, we might as well bail 3190d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber // out, even if there _were_ 10 bytes of valid mp3 audio data... 3200d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber return false; 3210d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber } 3220d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber 3230d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber if (memcmp("ID3", id3header, 3)) { 3240d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber break; 3250d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber } 32663f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber 32763f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber // Skip the ID3v2 header. 32863f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber 32963f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber size_t len = 33063f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber ((id3header[6] & 0x7f) << 21) 33163f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber | ((id3header[7] & 0x7f) << 14) 33263f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber | ((id3header[8] & 0x7f) << 7) 33363f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber | (id3header[9] & 0x7f); 33463f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber 33563f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber len += 10; 33663f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber 33763f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber *inout_pos += len; 3380d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber 3390d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber LOGV("skipped ID3 tag, new starting offset is %ld (0x%08lx)", 3400d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber *inout_pos, *inout_pos); 34163f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber } 34263f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber } 34363f20ec1a8d31c85261056c6c171140b93bcde0aAndreas Huber 3440d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber off_t pos = *inout_pos; 345e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bool valid = false; 346e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber do { 3470d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber if (pos >= *inout_pos + 128 * 1024) { 3480d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber // Don't scan forever. 3490d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber LOGV("giving up at offset %ld", pos); 3500d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber break; 3510d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber } 352e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3530d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber uint8_t tmp[4]; 3540d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber if (source->readAt(pos, tmp, 4) != 4) { 3550d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber break; 356e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 357e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3580d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber uint32_t header = U32_AT(tmp); 359e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 360e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (match_header != 0 && (header & kMask) != (match_header & kMask)) { 3610d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber ++pos; 362e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber continue; 363e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 364e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 365e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t frame_size; 366e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int sample_rate, num_channels, bitrate; 3672e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber if (!get_mp3_frame_size(header, &frame_size, 368e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber &sample_rate, &num_channels, &bitrate)) { 3690d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber ++pos; 3702e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber continue; 3712e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber } 372e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3730d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber LOGV("found possible 1st frame at %ld (header = 0x%08x)", pos, header); 374e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3752e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber // We found what looks like a valid frame, 3762e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber // now find its successors. 377e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3780d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber off_t test_pos = pos + frame_size; 379e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3802e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = true; 3812e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber for (int j = 0; j < 3; ++j) { 3822e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber uint8_t tmp[4]; 3839a12baf929ea803915d7ab626b200ffefb4fbac7Andreas Huber if (source->readAt(test_pos, tmp, 4) < 4) { 3842e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = false; 3852e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber break; 3862e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber } 387b16e5543713cc557bdc7ceef7c0a5a8b61f3232dAndreas Huber 3882e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber uint32_t test_header = U32_AT(tmp); 389e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3902e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber LOGV("subsequent header is %08x", test_header); 391e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3922e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber if ((test_header & kMask) != (header & kMask)) { 3932e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = false; 3942e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber break; 3952e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber } 396e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 3972e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber size_t test_frame_size; 3982e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber if (!get_mp3_frame_size(test_header, &test_frame_size)) { 3992e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = false; 4002e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber break; 401e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 4022e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber 4032e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber LOGV("found subsequent frame #%d at %ld", j + 2, test_pos); 4042e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber 4052e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber test_pos += test_frame_size; 406e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 407e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 408e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (valid) { 4090d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber *inout_pos = pos; 410e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 411e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_header != NULL) { 412e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_header = header; 413e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 414e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else { 415e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGV("no dice, no valid sequence of frames found."); 416e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 417e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 4180d34d8b4d5ad8695daef2e0db9e8316fab8942d4Andreas Huber ++pos; 419e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } while (!valid); 420e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 421e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return valid; 422e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 423e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 424e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberclass MP3Source : public MediaSource { 425e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberpublic: 426e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MP3Source( 427be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber const sp<MetaData> &meta, const sp<DataSource> &source, 4281ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang off_t first_frame_pos, uint32_t fixed_header, 4291ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int32_t byte_number, const char *table_of_contents); 430e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 431e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual status_t start(MetaData *params = NULL); 432e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual status_t stop(); 433e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 434e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual sp<MetaData> getFormat(); 435e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 436e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual status_t read( 437e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBuffer **buffer, const ReadOptions *options = NULL); 438e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 439be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huberprotected: 440be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber virtual ~MP3Source(); 441be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber 442e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberprivate: 443e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber sp<MetaData> mMeta; 444be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber sp<DataSource> mDataSource; 445e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t mFirstFramePos; 446e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t mFixedHeader; 447e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t mCurrentPos; 448e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int64_t mCurrentTimeUs; 449e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bool mStarted; 4501ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int32_t mByteNumber; // total number of bytes in this MP3 4511ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang // TOC entries in XING header. Skip the first one since it's always 0. 4521ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang char mTableOfContents[99]; 453e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBufferGroup *mGroup; 454e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 455e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MP3Source(const MP3Source &); 456e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MP3Source &operator=(const MP3Source &); 457e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber}; 458e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 459be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas HuberMP3Extractor::MP3Extractor(const sp<DataSource> &source) 460e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : mDataSource(source), 461e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFirstFramePos(-1), 4621ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mFixedHeader(0), 4631ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mByteNumber(0) { 464e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t pos = 0; 465e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header; 466e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bool success = Resync(mDataSource, 0, &pos, &header); 467b5ceb9ee21f37ae0817c16490c1fc148dd3eb5e2Andreas Huber CHECK(success); 468e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 469e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (success) { 470e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFirstFramePos = pos; 471e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFixedHeader = header; 472e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 473e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t frame_size; 474e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int sample_rate; 475e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int num_channels; 476e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int bitrate; 477e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber get_mp3_frame_size( 478e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber header, &frame_size, &sample_rate, &num_channels, &bitrate); 479e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 480e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta = new MetaData; 481e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 482e6c409632f773e41f33188272a0072be9fcb783fAndreas Huber mMeta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_MPEG); 483e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setInt32(kKeySampleRate, sample_rate); 484d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber mMeta->setInt32(kKeyBitRate, bitrate * 1000); 485e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setInt32(kKeyChannelCount, num_channels); 486e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 4871ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int64_t duration; 4881ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang parse_xing_header( 4891ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mDataSource, mFirstFramePos, NULL, &mByteNumber, 4901ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mTableOfContents, NULL, &duration); 4911ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (duration > 0) { 4921ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mMeta->setInt64(kKeyDuration, duration); 4931ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } else { 4941ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang off_t fileSize; 4951ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if (mDataSource->getSize(&fileSize) == OK) { 4961ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mMeta->setInt64( 4971ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang kKeyDuration, 4981ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang 8000LL * (fileSize - mFirstFramePos) / bitrate); 4991ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 500e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 501e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 502e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 503e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 504e46b7be812d68e49710b34048662cbf18e2a6550Andreas HuberMP3Extractor::~MP3Extractor() { 505e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 506e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 507be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Hubersize_t MP3Extractor::countTracks() { 508be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber return (mFirstFramePos < 0) ? 0 : 1; 509e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 510e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 511be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Hubersp<MediaSource> MP3Extractor::getTrack(size_t index) { 512e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (mFirstFramePos < 0 || index != 0) { 513be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber return NULL; 514e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 515e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 516be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber return new MP3Source( 5171ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mMeta, mDataSource, mFirstFramePos, mFixedHeader, 5181ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mByteNumber, mTableOfContents); 519e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 520e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 521e981c33446a98d5ccc0d73c1a840696d77cf0732Andreas Hubersp<MetaData> MP3Extractor::getTrackMetaData(size_t index, uint32_t flags) { 522e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (mFirstFramePos < 0 || index != 0) { 523e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return NULL; 524e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 525e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 526e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return mMeta; 527e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 528e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 529e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber//////////////////////////////////////////////////////////////////////////////// 530e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 531e46b7be812d68e49710b34048662cbf18e2a6550Andreas HuberMP3Source::MP3Source( 532be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber const sp<MetaData> &meta, const sp<DataSource> &source, 5331ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang off_t first_frame_pos, uint32_t fixed_header, 5341ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int32_t byte_number, const char *table_of_contents) 535e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : mMeta(meta), 536e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mDataSource(source), 537e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFirstFramePos(first_frame_pos), 538e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFixedHeader(fixed_header), 539e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos(0), 540e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentTimeUs(0), 541e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mStarted(false), 5421ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mByteNumber(byte_number), 543e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup(NULL) { 5445ebc8898d765321eafbbb7a12cfa529defcd484aAndreas Huber memcpy (mTableOfContents, table_of_contents, sizeof(mTableOfContents)); 545e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 546e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 547e46b7be812d68e49710b34048662cbf18e2a6550Andreas HuberMP3Source::~MP3Source() { 548e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (mStarted) { 549e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber stop(); 550e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 551e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 552e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 553e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Source::start(MetaData *) { 554b5ceb9ee21f37ae0817c16490c1fc148dd3eb5e2Andreas Huber CHECK(!mStarted); 555e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 556e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup = new MediaBufferGroup; 557e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 558e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber const size_t kMaxFrameSize = 32768; 559e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup->add_buffer(new MediaBuffer(kMaxFrameSize)); 560e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 561e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos = mFirstFramePos; 562e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentTimeUs = 0; 563e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 564e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mStarted = true; 565e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 566e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 567e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 568e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 569e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Source::stop() { 570b5ceb9ee21f37ae0817c16490c1fc148dd3eb5e2Andreas Huber CHECK(mStarted); 571e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 572e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber delete mGroup; 573e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup = NULL; 574e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 575e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mStarted = false; 576e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 577e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 578e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 579e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 580e46b7be812d68e49710b34048662cbf18e2a6550Andreas Hubersp<MetaData> MP3Source::getFormat() { 581e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return mMeta; 582e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 583e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 584e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Source::read( 585e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBuffer **out, const ReadOptions *options) { 586e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out = NULL; 587e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 588e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int64_t seekTimeUs; 589e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (options != NULL && options->getSeekTo(&seekTimeUs)) { 590e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int32_t bitrate; 591e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (!mMeta->findInt32(kKeyBitRate, &bitrate)) { 592d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber // bitrate is in bits/sec. 593e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGI("no bitrate"); 594e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 595e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_UNSUPPORTED; 596e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 597e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 598e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentTimeUs = seekTimeUs; 5991ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang // interpolate in TOC to get file seek point in bytes 6001ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int64_t duration; 6011ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if ((mByteNumber > 0) && (mTableOfContents[0] > 0) 6021ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang && mMeta->findInt64(kKeyDuration, &duration)) { 6031ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang float percent = (float)seekTimeUs * 100 / duration; 6041ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang float fx; 6051ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if( percent <= 0.0f ) { 6061ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang fx = 0.0f; 6071ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } else if( percent >= 100.0f ) { 6081ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang fx = 256.0f; 6091ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } else { 6101ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang int a = (int)percent; 6111ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang float fa, fb; 6121ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if ( a == 0 ) { 6131ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang fa = 0.0f; 6141ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } else { 6151ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang fa = (float)mTableOfContents[a-1]; 6161ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 6171ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang if ( a < 99 ) { 6181ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang fb = (float)mTableOfContents[a]; 6191ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } else { 6201ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang fb = 256.0f; 6211ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 6221ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang fx = fa + (fb-fa)*(percent-a); 6231ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 6241ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mCurrentPos = mFirstFramePos + (int)((1.0f/256.0f)*fx*mByteNumber); 6251ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } else { 6261ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang mCurrentPos = mFirstFramePos + seekTimeUs * bitrate / 8000000; 6271ba307d3c5800705e3fda10fb6c809f811c0f275Gloria Wang } 628e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 629e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 630e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBuffer *buffer; 631e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber status_t err = mGroup->acquire_buffer(&buffer); 632e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (err != OK) { 633e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return err; 634e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 635e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 636e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t frame_size; 637b64af9a221c1df4853ab7c7766d5f956c61b8765Andreas Huber int bitrate; 638e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber for (;;) { 6399a12baf929ea803915d7ab626b200ffefb4fbac7Andreas Huber ssize_t n = mDataSource->readAt(mCurrentPos, buffer->data(), 4); 640e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (n < 4) { 641e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->release(); 642e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer = NULL; 643e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 644e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_END_OF_STREAM; 645e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 646e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 647e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header = U32_AT((const uint8_t *)buffer->data()); 648b16e5543713cc557bdc7ceef7c0a5a8b61f3232dAndreas Huber 649b16e5543713cc557bdc7ceef7c0a5a8b61f3232dAndreas Huber if ((header & kMask) == (mFixedHeader & kMask) 650b64af9a221c1df4853ab7c7766d5f956c61b8765Andreas Huber && get_mp3_frame_size(header, &frame_size, NULL, NULL, &bitrate)) { 651e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber break; 652e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 653e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 654e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Lost sync. 6551d200e3b959f7562b21a6e9d94910ddd051cfe10Andreas Huber LOGV("lost sync! header = 0x%08x, old header = 0x%08x\n", header, mFixedHeader); 656e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 657e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t pos = mCurrentPos; 658e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (!Resync(mDataSource, mFixedHeader, &pos, NULL)) { 659e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGE("Unable to resync. Signalling end of stream."); 660e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 661e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->release(); 662e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer = NULL; 663e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 664e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_END_OF_STREAM; 665e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 666e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 667e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos = pos; 668e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 669e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Try again with the new position. 670e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 671e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 672b5ceb9ee21f37ae0817c16490c1fc148dd3eb5e2Andreas Huber CHECK(frame_size <= buffer->size()); 673e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 6749a12baf929ea803915d7ab626b200ffefb4fbac7Andreas Huber ssize_t n = mDataSource->readAt(mCurrentPos, buffer->data(), frame_size); 675e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (n < (ssize_t)frame_size) { 676e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->release(); 677e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer = NULL; 678e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 679e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_END_OF_STREAM; 680e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 681e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 682e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->set_range(0, frame_size); 683e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 684fa8de752507feaca695123911915070c1ce463b2Andreas Huber buffer->meta_data()->setInt64(kKeyTime, mCurrentTimeUs); 685e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 686e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos += frame_size; 687b64af9a221c1df4853ab7c7766d5f956c61b8765Andreas Huber mCurrentTimeUs += frame_size * 8000ll / bitrate; 688e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 689e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out = buffer; 690e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 691e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 692e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 693e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 694aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Hubersp<MetaData> MP3Extractor::getMetaData() { 695aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber sp<MetaData> meta = new MetaData; 696aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 6971cb02bf661807ffc6525dcc13e16d7ce027bef00Andreas Huber if (mFirstFramePos < 0) { 6981cb02bf661807ffc6525dcc13e16d7ce027bef00Andreas Huber return meta; 6991cb02bf661807ffc6525dcc13e16d7ce027bef00Andreas Huber } 7001cb02bf661807ffc6525dcc13e16d7ce027bef00Andreas Huber 701aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber meta->setCString(kKeyMIMEType, "audio/mpeg"); 702aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 703aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber ID3 id3(mDataSource); 704aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 705aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber if (!id3.isValid()) { 706aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber return meta; 707aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber } 708aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 709aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber struct Map { 710aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber int key; 711aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber const char *tag1; 712aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber const char *tag2; 713aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber }; 714aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber static const Map kMap[] = { 715aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber { kKeyAlbum, "TALB", "TAL" }, 716aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber { kKeyArtist, "TPE1", "TP1" }, 717c5d5ee34d7c1026ca8d5cd8b186e5a73c5230247Marco Nelissen { kKeyAlbumArtist, "TPE2", "TP2" }, 718aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber { kKeyComposer, "TCOM", "TCM" }, 719aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber { kKeyGenre, "TCON", "TCO" }, 7203a3656ce8a34bf4a17e806c1db1073848de2728fAndreas Huber { kKeyTitle, "TIT2", "TT2" }, 721aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber { kKeyYear, "TYE", "TYER" }, 7223a3656ce8a34bf4a17e806c1db1073848de2728fAndreas Huber { kKeyAuthor, "TXT", "TEXT" }, 7233a3656ce8a34bf4a17e806c1db1073848de2728fAndreas Huber { kKeyCDTrackNumber, "TRK", "TRCK" }, 724655306f8a80b3e9fc52daf458ef319a8ed8c564cMarco Nelissen { kKeyDiscNumber, "TPA", "TPOS" }, 725aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber }; 726aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber static const size_t kNumMapEntries = sizeof(kMap) / sizeof(kMap[0]); 727aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 728aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber for (size_t i = 0; i < kNumMapEntries; ++i) { 729aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber ID3::Iterator *it = new ID3::Iterator(id3, kMap[i].tag1); 730aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber if (it->done()) { 731aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber delete it; 732aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber it = new ID3::Iterator(id3, kMap[i].tag2); 733aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber } 734aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 735aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber if (it->done()) { 736aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber delete it; 737aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber continue; 738aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber } 739aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 740aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber String8 s; 741aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber it->getString(&s); 742aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber delete it; 743aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 744aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber meta->setCString(kMap[i].key, s); 745aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber } 746aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 747aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber size_t dataSize; 748aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber String8 mime; 749aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber const void *data = id3.getAlbumArt(&dataSize, &mime); 750aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 751aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber if (data) { 752aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber meta->setData(kKeyAlbumArt, MetaData::TYPE_NONE, data, dataSize); 753aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber meta->setCString(kKeyAlbumArtMIME, mime.string()); 754aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber } 755aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 756aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber return meta; 757aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber} 758aee3c6394a367abf283936cb8b8bd85ed028c050Andreas Huber 759be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huberbool SniffMP3( 760be06d26cdc70070654f1eedcd08c1c68cd587ad6Andreas Huber const sp<DataSource> &source, String8 *mimeType, float *confidence) { 761e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t pos = 0; 762e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header; 763e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (!Resync(source, 0, &pos, &header)) { 764e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 765e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 766e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 767e6c409632f773e41f33188272a0072be9fcb783fAndreas Huber *mimeType = MEDIA_MIMETYPE_AUDIO_MPEG; 768e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *confidence = 0.3f; 769e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 770e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return true; 771e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 772e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 773e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} // namespace android 774