diff options
Diffstat (limited to 'media/libstagefright/MP3Extractor.cpp')
| -rw-r--r-- | media/libstagefright/MP3Extractor.cpp | 164 |
1 files changed, 7 insertions, 157 deletions
diff --git a/media/libstagefright/MP3Extractor.cpp b/media/libstagefright/MP3Extractor.cpp index 4bdfc6f..5bbed5d 100644 --- a/media/libstagefright/MP3Extractor.cpp +++ b/media/libstagefright/MP3Extractor.cpp @@ -20,6 +20,7 @@ #include "include/MP3Extractor.h" +#include "include/avc_utils.h" #include "include/ID3.h" #include "include/VBRISeeker.h" #include "include/XINGSeeker.h" @@ -44,158 +45,6 @@ namespace android { // Yes ... there are things that must indeed match... static const uint32_t kMask = 0xfffe0c00; -// static -bool MP3Extractor::get_mp3_frame_size( - uint32_t header, size_t *frame_size, - int *out_sampling_rate, int *out_channels, - int *out_bitrate, int *out_num_samples) { - *frame_size = 0; - - if (out_sampling_rate) { - *out_sampling_rate = 0; - } - - if (out_channels) { - *out_channels = 0; - } - - if (out_bitrate) { - *out_bitrate = 0; - } - - if (out_num_samples) { - *out_num_samples = 1152; - } - - if ((header & 0xffe00000) != 0xffe00000) { - return false; - } - - unsigned version = (header >> 19) & 3; - - if (version == 0x01) { - return false; - } - - unsigned layer = (header >> 17) & 3; - - if (layer == 0x00) { - return false; - } - - unsigned protection = (header >> 16) & 1; - - unsigned bitrate_index = (header >> 12) & 0x0f; - - if (bitrate_index == 0 || bitrate_index == 0x0f) { - // Disallow "free" bitrate. - return false; - } - - unsigned sampling_rate_index = (header >> 10) & 3; - - if (sampling_rate_index == 3) { - return false; - } - - static const int kSamplingRateV1[] = { 44100, 48000, 32000 }; - int sampling_rate = kSamplingRateV1[sampling_rate_index]; - if (version == 2 /* V2 */) { - sampling_rate /= 2; - } else if (version == 0 /* V2.5 */) { - sampling_rate /= 4; - } - - unsigned padding = (header >> 9) & 1; - - if (layer == 3) { - // layer I - - static const int kBitrateV1[] = { - 32, 64, 96, 128, 160, 192, 224, 256, - 288, 320, 352, 384, 416, 448 - }; - - static const int kBitrateV2[] = { - 32, 48, 56, 64, 80, 96, 112, 128, - 144, 160, 176, 192, 224, 256 - }; - - int bitrate = - (version == 3 /* V1 */) - ? kBitrateV1[bitrate_index - 1] - : kBitrateV2[bitrate_index - 1]; - - if (out_bitrate) { - *out_bitrate = bitrate; - } - - *frame_size = (12000 * bitrate / sampling_rate + padding) * 4; - - if (out_num_samples) { - *out_num_samples = 384; - } - } else { - // layer II or III - - static const int kBitrateV1L2[] = { - 32, 48, 56, 64, 80, 96, 112, 128, - 160, 192, 224, 256, 320, 384 - }; - - static const int kBitrateV1L3[] = { - 32, 40, 48, 56, 64, 80, 96, 112, - 128, 160, 192, 224, 256, 320 - }; - - static const int kBitrateV2[] = { - 8, 16, 24, 32, 40, 48, 56, 64, - 80, 96, 112, 128, 144, 160 - }; - - int bitrate; - if (version == 3 /* V1 */) { - bitrate = (layer == 2 /* L2 */) - ? kBitrateV1L2[bitrate_index - 1] - : kBitrateV1L3[bitrate_index - 1]; - - if (out_num_samples) { - *out_num_samples = 1152; - } - } else { - // V2 (or 2.5) - - bitrate = kBitrateV2[bitrate_index - 1]; - if (out_num_samples) { - *out_num_samples = 576; - } - } - - if (out_bitrate) { - *out_bitrate = bitrate; - } - - if (version == 3 /* V1 */) { - *frame_size = 144000 * bitrate / sampling_rate + padding; - } else { - // V2 or V2.5 - *frame_size = 72000 * bitrate / sampling_rate + padding; - } - } - - if (out_sampling_rate) { - *out_sampling_rate = sampling_rate; - } - - if (out_channels) { - int channel_mode = (header >> 6) & 3; - - *out_channels = (channel_mode == 3) ? 1 : 2; - } - - return true; -} - static bool Resync( const sp<DataSource> &source, uint32_t match_header, off64_t *inout_pos, off64_t *post_id3_pos, uint32_t *out_header) { @@ -297,7 +146,7 @@ static bool Resync( size_t frame_size; int sample_rate, num_channels, bitrate; - if (!MP3Extractor::get_mp3_frame_size( + if (!GetMPEGAudioFrameSize( header, &frame_size, &sample_rate, &num_channels, &bitrate)) { ++pos; @@ -331,7 +180,7 @@ static bool Resync( } size_t test_frame_size; - if (!MP3Extractor::get_mp3_frame_size( + if (!GetMPEGAudioFrameSize( test_header, &test_frame_size)) { valid = false; break; @@ -437,7 +286,7 @@ MP3Extractor::MP3Extractor( int sample_rate; int num_channels; int bitrate; - get_mp3_frame_size( + GetMPEGAudioFrameSize( header, &frame_size, &sample_rate, &num_channels, &bitrate); mMeta = new MetaData; @@ -602,8 +451,9 @@ status_t MP3Source::read( uint32_t header = U32_AT((const uint8_t *)buffer->data()); if ((header & kMask) == (mFixedHeader & kMask) - && MP3Extractor::get_mp3_frame_size( - header, &frame_size, &sample_rate, NULL, &bitrate, &num_samples)) { + && GetMPEGAudioFrameSize( + header, &frame_size, &sample_rate, NULL, + &bitrate, &num_samples)) { break; } |