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* let DV muxer generate audioless DV streams. This might not be 100%

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complaint with the SMPTE & IEC specs, but it seems harmless enough.
     The way we "specify" that there's no audio is by simply leaving
     audio DIFs filled with 0xff (I bet there's a way to mark this
     properly in the system info section!).

Originally committed as revision 3526 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik 2004-09-27 22:46:36 +00:00
parent e4a185ac14
commit 96319c3922
1 changed files with 36 additions and 28 deletions
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64
libavformat/dv.c
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@ -377,9 +377,9 @@ static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
/* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
for (j = 0; j < 135; j++) {
if (j%15 == 0) {
memset(buf, 0xff, 80);
buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);
buf += 72; /* shuffled PCM audio */
buf += 77; /* audio control & shuffled PCM audio */
}
buf += dv_write_dif_id(dv_sect_video, i, j, buf);
buf += 77; /* 1 video macro block: 1 bytes control
@ -397,6 +397,7 @@ static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_
for (i = 0; i < c->sys->difseg_size; i++) {
frame_ptr += 6 * 80; /* skip DIF segment header */
for (j = 0; j < 9; j++) {
dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3]);
for (d = 8; d < 80; d+=2) {
of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
if (of*2 >= size)
@ -614,7 +615,9 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st,
if (c->has_audio && c->has_video) { /* must be a stale frame */
dv_format_frame(c, *frame);
c->frames++;
c->has_audio = c->has_video = 0;
if (c->has_audio > 0)
c->has_audio = 0;
c->has_video = 0;
}
if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
@ -625,6 +628,8 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st,
dv_inject_video(c, data, *frame);
c->has_video = 1;
data_size = 0;
if (c->has_audio < 0)
goto out;
}
reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
@ -649,56 +654,59 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st,
fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
}
out:
return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
}
DVMuxContext* dv_init_mux(AVFormatContext* s)
{
DVMuxContext *c;
AVStream *vst;
AVStream *ast;
AVStream *vst = NULL;
AVStream *ast = NULL;
int i;
if (s->nb_streams > 2)
return NULL;
c = av_mallocz(sizeof(DVMuxContext));
if (!c)
return NULL;
if (s->nb_streams != 2)
goto bail_out;
/* We have to sort out where audio and where video stream is */
if (s->streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&
s->streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {
vst = s->streams[0];
ast = s->streams[1];
for (i=0; i<s->nb_streams; i++) {
switch (s->streams[i]->codec.codec_type) {
case CODEC_TYPE_VIDEO:
vst = s->streams[i];
break;
case CODEC_TYPE_AUDIO:
ast = s->streams[i];
break;
default:
goto bail_out;
}
}
else if (s->streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&
s->streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {
vst = s->streams[1];
ast = s->streams[0];
} else
goto bail_out;
/* Some checks -- DV format is very picky about its incoming streams */
if (vst->codec.codec_id != CODEC_ID_DVVIDEO ||
ast->codec.codec_id != CODEC_ID_PCM_S16LE)
goto bail_out;
if (ast->codec.sample_rate != 48000 ||
ast->codec.channels != 2)
goto bail_out;
if (!vst || vst->codec.codec_id != CODEC_ID_DVVIDEO)
goto bail_out;
if (ast && (ast->codec.codec_id != CODEC_ID_PCM_S16LE ||
ast->codec.sample_rate != 48000 ||
ast->codec.channels != 2))
goto bail_out;
c->sys = dv_codec_profile(&vst->codec);
if (!c->sys)
goto bail_out;
/* Ok, everything seems to be in working order */
c->frames = 0;
c->has_audio = c->has_video = 0;
c->has_audio = ast ? 0 : -1;
c->has_video = 0;
c->start_time = (time_t)s->timestamp;
c->aspect = 0; /* 4:3 is the default */
if ((int)(av_q2d(vst->codec.sample_aspect_ratio) * vst->codec.width / vst->codec.height * 10) == 17) /* 16:9 */
c->aspect = 0x07;
if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
if (ast && fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
goto bail_out;
dv_format_frame(c, &c->frame_buf[0]);