avcodec: add av_get_audio_frame_duration() function.
This is a utility function for the user to get the frame duration based on the codec id, frame size in bytes, and various AVCodecContext parameters.
This commit is contained in:
Justin Ruggles
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6699d07480
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9524cf79df
@ -12,6 +12,10 @@ libavutil: 2011-04-18
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API changes, most recent first:
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2012-xx-xx - lavc 54.8.0
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xxxxxxx Add av_get_exact_bits_per_sample()
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xxxxxxx Add av_get_audio_frame_duration()
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2012-03-xx - xxxxxxx - lavc 54.7.0 - avcodec.h
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Add av_codec_is_encoder/decoder().
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@ -3942,6 +3942,16 @@ int av_get_bits_per_sample(enum CodecID codec_id);
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*/
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int av_get_exact_bits_per_sample(enum CodecID codec_id);
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/**
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* Return audio frame duration.
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*
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* @param avctx codec context
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* @param frame_bytes size of the frame, or 0 if unknown
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* @return frame duration, in samples, if known. 0 if not able to
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* determine.
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*/
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int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
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/* frame parsing */
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typedef struct AVCodecParserContext {
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void *priv_data;
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@ -1742,6 +1742,148 @@ int av_get_bits_per_sample(enum CodecID codec_id)
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}
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}
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int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
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{
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int id, sr, ch, ba, tag, bps;
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id = avctx->codec_id;
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sr = avctx->sample_rate;
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ch = avctx->channels;
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ba = avctx->block_align;
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tag = avctx->codec_tag;
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bps = av_get_exact_bits_per_sample(avctx->codec_id);
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/* codecs with an exact constant bits per sample */
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if (bps > 0 && ch > 0 && frame_bytes > 0)
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return (frame_bytes * 8) / (bps * ch);
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bps = avctx->bits_per_coded_sample;
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/* codecs with a fixed packet duration */
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switch (id) {
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case CODEC_ID_ADPCM_ADX: return 32;
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case CODEC_ID_ADPCM_IMA_QT: return 64;
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case CODEC_ID_ADPCM_EA_XAS: return 128;
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case CODEC_ID_AMR_NB:
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case CODEC_ID_GSM:
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case CODEC_ID_QCELP:
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case CODEC_ID_RA_144:
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case CODEC_ID_RA_288: return 160;
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case CODEC_ID_IMC: return 256;
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case CODEC_ID_AMR_WB:
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case CODEC_ID_GSM_MS: return 320;
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case CODEC_ID_MP1: return 384;
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case CODEC_ID_ATRAC1: return 512;
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case CODEC_ID_ATRAC3: return 1024;
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case CODEC_ID_MP2:
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case CODEC_ID_MUSEPACK7: return 1152;
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case CODEC_ID_AC3: return 1536;
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}
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if (sr > 0) {
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/* calc from sample rate */
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if (id == CODEC_ID_TTA)
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return 256 * sr / 245;
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if (ch > 0) {
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/* calc from sample rate and channels */
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if (id == CODEC_ID_BINKAUDIO_DCT)
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return (480 << (sr / 22050)) / ch;
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}
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}
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if (ba > 0) {
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/* calc from block_align */
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if (id == CODEC_ID_SIPR) {
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switch (ba) {
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case 20: return 160;
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case 19: return 144;
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case 29: return 288;
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case 37: return 480;
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}
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}
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}
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if (frame_bytes > 0) {
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/* calc from frame_bytes only */
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if (id == CODEC_ID_TRUESPEECH)
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return 240 * (frame_bytes / 32);
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if (id == CODEC_ID_NELLYMOSER)
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return 256 * (frame_bytes / 64);
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if (bps > 0) {
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/* calc from frame_bytes and bits_per_coded_sample */
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if (id == CODEC_ID_ADPCM_G726)
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return frame_bytes * 8 / bps;
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}
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if (ch > 0) {
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/* calc from frame_bytes and channels */
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switch (id) {
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case CODEC_ID_ADPCM_4XM:
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case CODEC_ID_ADPCM_IMA_ISS:
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return (frame_bytes - 4 * ch) * 2 / ch;
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case CODEC_ID_ADPCM_IMA_SMJPEG:
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return (frame_bytes - 4) * 2 / ch;
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case CODEC_ID_ADPCM_IMA_AMV:
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return (frame_bytes - 8) * 2 / ch;
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case CODEC_ID_ADPCM_XA:
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return (frame_bytes / 128) * 224 / ch;
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case CODEC_ID_INTERPLAY_DPCM:
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return (frame_bytes - 6 - ch) / ch;
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case CODEC_ID_ROQ_DPCM:
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return (frame_bytes - 8) / ch;
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case CODEC_ID_XAN_DPCM:
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return (frame_bytes - 2 * ch) / ch;
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case CODEC_ID_MACE3:
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return 3 * frame_bytes / ch;
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case CODEC_ID_MACE6:
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return 6 * frame_bytes / ch;
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case CODEC_ID_PCM_LXF:
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return 2 * (frame_bytes / (5 * ch));
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}
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if (tag) {
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/* calc from frame_bytes, channels, and codec_tag */
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if (id == CODEC_ID_SOL_DPCM) {
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if (tag == 3)
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return frame_bytes / ch;
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else
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return frame_bytes * 2 / ch;
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}
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}
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if (ba > 0) {
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/* calc from frame_bytes, channels, and block_align */
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int blocks = frame_bytes / ba;
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switch (avctx->codec_id) {
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case CODEC_ID_ADPCM_IMA_WAV:
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return blocks * (1 + (ba - 4 * ch) / (4 * ch) * 8);
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case CODEC_ID_ADPCM_IMA_DK3:
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return blocks * (((ba - 16) * 8 / 3) / ch);
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case CODEC_ID_ADPCM_IMA_DK4:
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return blocks * (1 + (ba - 4 * ch) * 2 / ch);
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case CODEC_ID_ADPCM_MS:
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return blocks * (2 + (ba - 7 * ch) * 2 / ch);
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}
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}
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if (bps > 0) {
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/* calc from frame_bytes, channels, and bits_per_coded_sample */
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switch (avctx->codec_id) {
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case CODEC_ID_PCM_DVD:
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return 2 * (frame_bytes / ((bps * 2 / 8) * ch));
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case CODEC_ID_PCM_BLURAY:
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return frame_bytes / ((FFALIGN(ch, 2) * bps) / 8);
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case CODEC_ID_S302M:
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return 2 * (frame_bytes / ((bps + 4) / 4)) / ch;
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}
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}
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}
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}
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return 0;
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}
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#if !HAVE_THREADS
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int ff_thread_init(AVCodecContext *s){
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return -1;
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@ -21,7 +21,7 @@
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#define AVCODEC_VERSION_H
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#define LIBAVCODEC_VERSION_MAJOR 54
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#define LIBAVCODEC_VERSION_MINOR 7
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#define LIBAVCODEC_VERSION_MINOR 8
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#define LIBAVCODEC_VERSION_MICRO 0
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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