Browse code
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.
Justin Ruggles authored on 2012/01/27 10:08:23Showing 4 changed files
| ... | ... |
@@ -12,6 +12,10 @@ libavutil: 2011-04-18 |
| 12 | 12 |
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| 13 | 13 |
API changes, most recent first: |
| 14 | 14 |
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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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+ |
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| 15 | 19 |
2012-03-xx - xxxxxxx - lavc 54.7.0 - avcodec.h |
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Add av_codec_is_encoder/decoder(). |
| 17 | 21 |
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@@ -3942,6 +3942,16 @@ int av_get_bits_per_sample(enum CodecID codec_id); |
| 3942 | 3942 |
*/ |
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int av_get_exact_bits_per_sample(enum CodecID codec_id); |
| 3944 | 3944 |
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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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+ |
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/* frame parsing */ |
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typedef struct AVCodecParserContext {
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void *priv_data; |
| ... | ... |
@@ -1742,6 +1742,148 @@ int av_get_bits_per_sample(enum CodecID codec_id) |
| 1742 | 1742 |
} |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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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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+ |
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+ return 0; |
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+} |
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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; |
| ... | ... |
@@ -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, \ |