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qtmux: handle muxing adpcm correctly.

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This commit is contained in:
Michael Smith 2010-01-27 15:37:37 -08:00
parent e1fe7f357f
commit 4b28a46bc7
1 changed files with 19 additions and 2 deletions
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21
gst/qtmux/gstqtmux.c
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@ -1496,15 +1496,23 @@ gst_qt_mux_add_buffer (GstQTMux * qtmux, GstQTPad * pad, GstBuffer * buf)
last_dts = gst_util_uint64_scale_round (pad->last_dts,
atom_trak_get_timescale (pad->trak), GST_SECOND);
/* raw audio has many samples per buffer (= chunk) */
if (pad->sample_size) {
/* Constant size packets: usually raw audio (with many samples per
buffer (= chunk)), but can also be fixed-packet-size codecs like ADPCM
*/
sample_size = pad->sample_size;
if (GST_BUFFER_SIZE (last_buf) % sample_size != 0)
goto fragmented_sample;
/* note: qt raw audio storage warps it implicitly into a timewise
* perfect stream, discarding buffer times */
nsamples = GST_BUFFER_SIZE (last_buf) / sample_size;
if (GST_BUFFER_DURATION (last_buf) != GST_CLOCK_TIME_NONE) {
nsamples = gst_util_uint64_scale_round (GST_BUFFER_DURATION (last_buf),
atom_trak_get_timescale (pad->trak), GST_SECOND);
} else {
nsamples = GST_BUFFER_SIZE (last_buf) / sample_size;
}
duration = GST_BUFFER_DURATION (last_buf) / nsamples;
/* timescale = samplerate */
scaled_duration = 1;
pad->last_dts += duration * nsamples;
@ -1949,6 +1957,15 @@ gst_qt_mux_audio_sink_set_caps (GstPad * pad, GstCaps * caps)
entry.samples_per_packet = 2 * blocksize / channels - 7;
entry.bytes_per_sample = 2;
entry.bytes_per_frame = blocksize;
entry.bytes_per_packet = blocksize / channels;
/* ADPCM has constant size packets */
constant_size = 1;
/* TODO: I don't really understand why this helps, but it does! Constant
* size and compression_id of -2 seem to be incompatible, and other files
* in the wild use this too. */
entry.compression_id = -1;
ext_atom = build_ima_adpcm_extension (channels, rate, blocksize);
}