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flvdec: Build a Speex header during FLV demuxing using required and

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default values. This is needed because FLV files with Speex do not
contain a Speex header, which is necessary for stream copy.

Originally committed as revision 19267 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2009-06-24 22:10:53 +00:00
parent c173a0881f
commit c1c206b343
1 changed files with 34 additions and 0 deletions
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34
libavformat/flvdec.c
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@ -24,6 +24,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/ */
#include "libavcodec/bytestream.h"
#include "libavcodec/mpeg4audio.h" #include "libavcodec/mpeg4audio.h"
#include "avformat.h" #include "avformat.h"
#include "flv.h" #include "flv.h"
@ -43,6 +44,32 @@ static int flv_probe(AVProbeData *p)
return 0; return 0;
} }
/**
* Builds a Speex header.
* This is not needed for the libavcodec libspeex decoder, but is needed for
* stream copy and for decoders which require a header.
*/
static void flv_build_speex_header(uint8_t *extradata)
{
memset(extradata, 0, 80);
bytestream_put_buffer(&extradata, "Speex ", 8); // speex_string
bytestream_put_buffer(&extradata, "1.2rc1", 6); // speex_version
extradata += 14; // speex_version padding
bytestream_put_le32(&extradata, 1); // speex_version_id
bytestream_put_le32(&extradata, 80); // header_size
bytestream_put_le32(&extradata, 16000); // rate
bytestream_put_le32(&extradata, 1); // mode
bytestream_put_le32(&extradata, 4); // mode_bitstream_version
bytestream_put_le32(&extradata, 1); // nb_channels
bytestream_put_le32(&extradata, -1); // bitrate
bytestream_put_le32(&extradata, 320); // frame_size
// vbr = 0
// frames_per_packet = 0
// extra_headers = 0
// reserved1 = 0
// reserved2 = 0
}
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) { static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
AVCodecContext *acodec = astream->codec; AVCodecContext *acodec = astream->codec;
switch(flv_codecid) { switch(flv_codecid) {
@ -62,6 +89,13 @@ static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_c
case FLV_CODECID_SPEEX: case FLV_CODECID_SPEEX:
acodec->codec_id = CODEC_ID_SPEEX; acodec->codec_id = CODEC_ID_SPEEX;
acodec->sample_rate = 16000; acodec->sample_rate = 16000;
acodec->extradata = av_mallocz(80 + FF_INPUT_BUFFER_PADDING_SIZE);
if (acodec->extradata) {
acodec->extradata_size = 80;
flv_build_speex_header(acodec->extradata);
} else {
av_log(s, AV_LOG_WARNING, "Unable to create Speex extradata\n");
}
break; break;
case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break; case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
case FLV_CODECID_NELLYMOSER_8KHZ_MONO: case FLV_CODECID_NELLYMOSER_8KHZ_MONO: