MP3Extractor.cpp revision 2e337a4e4b5d36228619d426255f7aa500b5b4ac
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 21e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#undef NDEBUG 22e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <assert.h> 23e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 24e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/DataSource.h> 25e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MP3Extractor.h> 26e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaBuffer.h> 27e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaBufferGroup.h> 28e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaErrors.h> 29e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MediaSource.h> 30e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/MetaData.h> 31e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <media/stagefright/Utils.h> 32e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber#include <utils/String8.h> 33e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 34e46b7be812d68e49710b34048662cbf18e2a6550Andreas Hubernamespace android { 35e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 36e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatic bool get_mp3_frame_size( 37e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header, size_t *frame_size, 38e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int *out_sampling_rate = NULL, int *out_channels = NULL, 39e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int *out_bitrate = NULL) { 40e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *frame_size = 0; 41e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 42e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_sampling_rate) { 43e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_sampling_rate = 0; 44e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 45e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 46e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_channels) { 47e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_channels = 0; 48e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 49e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 50e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_bitrate) { 51e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_bitrate = 0; 52e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 53e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 54e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if ((header & 0xffe00000) != 0xffe00000) { 55e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 56e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 57e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 58e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned version = (header >> 19) & 3; 59e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 60e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (version == 0x01) { 61e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 62e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 63e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 64e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned layer = (header >> 17) & 3; 65e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 66e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (layer == 0x00) { 67e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 68e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 69e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 70e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned protection = (header >> 16) & 1; 71e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 72e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned bitrate_index = (header >> 12) & 0x0f; 73e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 74e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (bitrate_index == 0 || bitrate_index == 0x0f) { 75e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Disallow "free" bitrate. 762e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber 772e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber LOGE("We disallow 'free' bitrate for now."); 78e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 79e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 80e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 81e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned sampling_rate_index = (header >> 10) & 3; 82e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 83e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (sampling_rate_index == 3) { 84e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 85e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 86e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 87e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kSamplingRateV1[] = { 44100, 48000, 32000 }; 88e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int sampling_rate = kSamplingRateV1[sampling_rate_index]; 89e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (version == 2 /* V2 */) { 90e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber sampling_rate /= 2; 91e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else if (version == 0 /* V2.5 */) { 92e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber sampling_rate /= 4; 93e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 94e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 95e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber unsigned padding = (header >> 9) & 1; 96e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 97e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (layer == 3) { 98e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // layer I 99e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 100e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV1[] = { 101e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 64, 96, 128, 160, 192, 224, 256, 102e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 288, 320, 352, 384, 416, 448 103e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 104e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 105e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV2[] = { 106e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 48, 56, 64, 80, 96, 112, 128, 107e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 144, 160, 176, 192, 224, 256 108e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 109e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 110e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int bitrate = 111e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber (version == 3 /* V1 */) 112e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ? kBitrateV1[bitrate_index - 1] 113e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : kBitrateV2[bitrate_index - 1]; 114e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 115e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_bitrate) { 116e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_bitrate = bitrate; 117e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 118e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 119e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *frame_size = (12000 * bitrate / sampling_rate + padding) * 4; 120e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else { 121e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // layer II or III 122e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 123e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV1L2[] = { 124e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 48, 56, 64, 80, 96, 112, 128, 125e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 160, 192, 224, 256, 320, 384 126e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 127e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 128e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV1L3[] = { 129e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 32, 40, 48, 56, 64, 80, 96, 112, 130e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 128, 160, 192, 224, 256, 320 131e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 132e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 133e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber static const int kBitrateV2[] = { 134e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 8, 16, 24, 32, 40, 48, 56, 64, 135e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 80, 96, 112, 128, 144, 160 136e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber }; 137e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 138e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int bitrate; 139e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (version == 3 /* V1 */) { 140e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bitrate = (layer == 2 /* L2 */) 141e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ? kBitrateV1L2[bitrate_index - 1] 142e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : kBitrateV1L3[bitrate_index - 1]; 143e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else { 144e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // V2 (or 2.5) 145e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 146e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bitrate = kBitrateV2[bitrate_index - 1]; 147e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 148e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 149e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_bitrate) { 150e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_bitrate = bitrate; 151e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 152e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 153e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *frame_size = 144000 * bitrate / sampling_rate + padding; 154e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 155e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 156e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_sampling_rate) { 157e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_sampling_rate = sampling_rate; 158e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 159e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 160e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_channels) { 161e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int channel_mode = (header >> 6) & 3; 162e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 163e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_channels = (channel_mode == 3) ? 1 : 2; 164e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 165e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 166e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return true; 167e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 168e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 169e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatic bool Resync( 170e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber DataSource *source, uint32_t match_header, 171e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t *inout_pos, uint32_t *out_header) { 172e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Everything must match except for 173e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // protection, bitrate, padding, private bits and mode extension. 174e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber const uint32_t kMask = 0xfffe0ccf; 175e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 176e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber const size_t kMaxFrameSize = 4096; 177e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint8_t *buffer = new uint8_t[kMaxFrameSize]; 178e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 1792e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber off_t pos = *inout_pos - kMaxFrameSize; 180e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t buffer_offset = kMaxFrameSize; 181e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t buffer_length = kMaxFrameSize; 182e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bool valid = false; 183e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber do { 184e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (buffer_offset + 3 >= buffer_length) { 185e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (buffer_length < kMaxFrameSize) { 186e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber break; 187e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 188e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 1892e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber pos += buffer_offset; 190e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 191e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (pos >= *inout_pos + 128 * 1024) { 192e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Don't scan forever. 193e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGV("giving up at offset %ld", pos); 194e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber break; 195e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 196e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 197e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber memmove(buffer, &buffer[buffer_offset], buffer_length - buffer_offset); 198e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer_length = buffer_length - buffer_offset; 199e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer_offset = 0; 200e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 201e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ssize_t n = source->read_at( 202e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber pos, &buffer[buffer_length], kMaxFrameSize - buffer_length); 203e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 204e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (n <= 0) { 205e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber break; 206e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 207e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 208e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer_length += (size_t)n; 209e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 210e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber continue; 211e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 212e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 213e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header = U32_AT(&buffer[buffer_offset]); 214e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 215e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (match_header != 0 && (header & kMask) != (match_header & kMask)) { 216e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ++buffer_offset; 217e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber continue; 218e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 219e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 220e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t frame_size; 221e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int sample_rate, num_channels, bitrate; 2222e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber if (!get_mp3_frame_size(header, &frame_size, 223e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber &sample_rate, &num_channels, &bitrate)) { 2242e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber ++buffer_offset; 2252e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber continue; 2262e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber } 227e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2282e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber LOGV("found possible 1st frame at %ld", pos + buffer_offset); 229e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2302e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber // We found what looks like a valid frame, 2312e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber // now find its successors. 232e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2332e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber off_t test_pos = pos + buffer_offset + frame_size; 234e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2352e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = true; 2362e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber for (int j = 0; j < 3; ++j) { 2372e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber uint8_t tmp[4]; 2382e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber if (source->read_at(test_pos, tmp, 4) < 4) { 2392e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = false; 2402e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber break; 2412e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber } 2422e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber 2432e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber uint32_t test_header = U32_AT(tmp); 244e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2452e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber LOGV("subsequent header is %08x", test_header); 246e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2472e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber if ((test_header & kMask) != (header & kMask)) { 2482e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = false; 2492e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber break; 2502e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber } 251e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 2522e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber size_t test_frame_size; 2532e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber if (!get_mp3_frame_size(test_header, &test_frame_size)) { 2542e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber valid = false; 2552e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber break; 256e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 2572e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber 2582e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber LOGV("found subsequent frame #%d at %ld", j + 2, test_pos); 2592e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber 2602e337a4e4b5d36228619d426255f7aa500b5b4acAndreas Huber test_pos += test_frame_size; 261e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 262e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 263e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (valid) { 264e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *inout_pos = pos + buffer_offset; 265e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 266e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (out_header != NULL) { 267e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out_header = header; 268e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 269e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } else { 270e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGV("no dice, no valid sequence of frames found."); 271e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 272e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 273e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ++buffer_offset; 274e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 275e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } while (!valid); 276e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 277e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber delete[] buffer; 278e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer = NULL; 279e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 280e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return valid; 281e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 282e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 283e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberclass MP3Source : public MediaSource { 284e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberpublic: 285e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MP3Source( 286e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber const sp<MetaData> &meta, DataSource *source, 287e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t first_frame_pos, uint32_t fixed_header); 288e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 289e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual ~MP3Source(); 290e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 291e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual status_t start(MetaData *params = NULL); 292e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual status_t stop(); 293e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 294e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual sp<MetaData> getFormat(); 295e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 296e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber virtual status_t read( 297e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBuffer **buffer, const ReadOptions *options = NULL); 298e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 299e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberprivate: 300e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber sp<MetaData> mMeta; 301e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber DataSource *mDataSource; 302e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t mFirstFramePos; 303e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t mFixedHeader; 304e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t mCurrentPos; 305e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int64_t mCurrentTimeUs; 306e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bool mStarted; 307e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 308e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBufferGroup *mGroup; 309e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 310e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MP3Source(const MP3Source &); 311e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MP3Source &operator=(const MP3Source &); 312e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber}; 313e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 314e46b7be812d68e49710b34048662cbf18e2a6550Andreas HuberMP3Extractor::MP3Extractor(DataSource *source) 315e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : mDataSource(source), 316e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFirstFramePos(-1), 317e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFixedHeader(0) { 318e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t pos = 0; 319e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header; 320e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber bool success = Resync(mDataSource, 0, &pos, &header); 321e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber assert(success); 322e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 323e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (success) { 324e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFirstFramePos = pos; 325e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFixedHeader = header; 326e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 327e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t frame_size; 328e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int sample_rate; 329e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int num_channels; 330e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int bitrate; 331e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber get_mp3_frame_size( 332e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber header, &frame_size, &sample_rate, &num_channels, &bitrate); 333e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 334e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta = new MetaData; 335e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 336e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setCString(kKeyMIMEType, "audio/mpeg"); 337e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setInt32(kKeySampleRate, sample_rate); 338e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setInt32(kKeyBitRate, bitrate); 339e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setInt32(kKeyChannelCount, num_channels); 340e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 341e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t fileSize; 342e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (mDataSource->getSize(&fileSize) == OK) { 343e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setInt32( 344e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber kKeyDuration, 345e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 8 * (fileSize - mFirstFramePos) / bitrate); 346e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta->setInt32(kKeyTimeScale, 1000); 347e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 348e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 349e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 350e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 351e46b7be812d68e49710b34048662cbf18e2a6550Andreas HuberMP3Extractor::~MP3Extractor() { 352e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber delete mDataSource; 353e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mDataSource = NULL; 354e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 355e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 356e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Extractor::countTracks(int *num_tracks) { 357e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *num_tracks = mFirstFramePos < 0 ? 0 : 1; 358e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 359e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 360e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 361e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 362e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Extractor::getTrack(int index, MediaSource **source) { 363e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (mFirstFramePos < 0 || index != 0) { 364e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_OUT_OF_RANGE; 365e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 366e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 367e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *source = new MP3Source( 368e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mMeta, mDataSource, mFirstFramePos, mFixedHeader); 369e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 370e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 371e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 372e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 373e46b7be812d68e49710b34048662cbf18e2a6550Andreas Hubersp<MetaData> MP3Extractor::getTrackMetaData(int index) { 374e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (mFirstFramePos < 0 || index != 0) { 375e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return NULL; 376e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 377e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 378e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return mMeta; 379e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 380e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 381e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber//////////////////////////////////////////////////////////////////////////////// 382e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 383e46b7be812d68e49710b34048662cbf18e2a6550Andreas HuberMP3Source::MP3Source( 384e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber const sp<MetaData> &meta, DataSource *source, 385e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t first_frame_pos, uint32_t fixed_header) 386e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber : mMeta(meta), 387e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mDataSource(source), 388e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFirstFramePos(first_frame_pos), 389e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mFixedHeader(fixed_header), 390e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos(0), 391e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentTimeUs(0), 392e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mStarted(false), 393e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup(NULL) { 394e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 395e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 396e46b7be812d68e49710b34048662cbf18e2a6550Andreas HuberMP3Source::~MP3Source() { 397e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (mStarted) { 398e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber stop(); 399e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 400e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 401e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 402e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Source::start(MetaData *) { 403e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber assert(!mStarted); 404e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 405e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup = new MediaBufferGroup; 406e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 407e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber const size_t kMaxFrameSize = 32768; 408e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup->add_buffer(new MediaBuffer(kMaxFrameSize)); 409e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 410e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos = mFirstFramePos; 411e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentTimeUs = 0; 412e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 413e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mStarted = true; 414e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 415e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 416e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 417e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 418e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Source::stop() { 419e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber assert(mStarted); 420e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 421e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber delete mGroup; 422e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mGroup = NULL; 423e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 424e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mStarted = false; 425e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 426e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 427e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 428e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 429e46b7be812d68e49710b34048662cbf18e2a6550Andreas Hubersp<MetaData> MP3Source::getFormat() { 430e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return mMeta; 431e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 432e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 433e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberstatus_t MP3Source::read( 434e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBuffer **out, const ReadOptions *options) { 435e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out = NULL; 436e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 437e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int64_t seekTimeUs; 438e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (options != NULL && options->getSeekTo(&seekTimeUs)) { 439e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber int32_t bitrate; 440e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (!mMeta->findInt32(kKeyBitRate, &bitrate)) { 441e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // bitrate is in kbits/sec. 442e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGI("no bitrate"); 443e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 444e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_UNSUPPORTED; 445e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 446e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 447e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentTimeUs = seekTimeUs; 448e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos = mFirstFramePos + seekTimeUs * bitrate / 1000000 * 125; 449e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 450e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 451e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber MediaBuffer *buffer; 452e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber status_t err = mGroup->acquire_buffer(&buffer); 453e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (err != OK) { 454e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return err; 455e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 456e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 457e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber size_t frame_size; 458e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber for (;;) { 459e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ssize_t n = mDataSource->read_at(mCurrentPos, buffer->data(), 4); 460e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (n < 4) { 461e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->release(); 462e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer = NULL; 463e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 464e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_END_OF_STREAM; 465e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 466e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 467e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header = U32_AT((const uint8_t *)buffer->data()); 468e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 469e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (get_mp3_frame_size(header, &frame_size)) { 470e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber break; 471e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 472e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 473e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Lost sync. 474e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGW("lost sync!\n"); 475e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 476e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t pos = mCurrentPos; 477e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (!Resync(mDataSource, mFixedHeader, &pos, NULL)) { 478e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber LOGE("Unable to resync. Signalling end of stream."); 479e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 480e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->release(); 481e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer = NULL; 482e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 483e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_END_OF_STREAM; 484e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 485e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 486e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos = pos; 487e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 488e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber // Try again with the new position. 489e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 490e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 491e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber assert(frame_size <= buffer->size()); 492e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 493e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber ssize_t n = mDataSource->read_at(mCurrentPos, buffer->data(), frame_size); 494e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (n < (ssize_t)frame_size) { 495e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->release(); 496e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer = NULL; 497e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 498e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return ERROR_END_OF_STREAM; 499e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 500e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 501e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->set_range(0, frame_size); 502e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 503e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->meta_data()->setInt32(kKeyTimeUnits, mCurrentTimeUs / 1000); 504e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber buffer->meta_data()->setInt32(kKeyTimeScale, 1000); 505e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 506e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentPos += frame_size; 507e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber mCurrentTimeUs += 1152 * 1000000 / 44100; 508e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 509e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *out = buffer; 510e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 511e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return OK; 512e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 513e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 514e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huberbool SniffMP3(DataSource *source, String8 *mimeType, float *confidence) { 515e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber off_t pos = 0; 516e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber uint32_t header; 517e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber if (!Resync(source, 0, &pos, &header)) { 518e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return false; 519e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber } 520e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 521e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *mimeType = "audio/mpeg"; 522e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber *confidence = 0.3f; 523e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 524e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber return true; 525e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} 526e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber 527e46b7be812d68e49710b34048662cbf18e2a6550Andreas Huber} // namespace android 528