opensource/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-08-06 15:49:50 +08:00
Code Issues Packages Projects Releases Wiki Activity

Intial implementation of the DV100 (AKA DVCPRO HD) decoder and demuxer as

Browse Source 
specified in SMPTE 370M

Originally committed as revision 15010 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik
2008-08-28 22:41:00 +00:00
parent 42f72a3ac4
commit f8007a1473
5 changed files with 3839 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
libavformat/dv.c
View File

@ -8,8 +8,9 @@
* Raw DV format
* Copyright (c) 2002 Fabrice Bellard.
*
* 50 Mbps (DVCPRO50) support
* 50 Mbps (DVCPRO50) and 100 Mbps (DVCPRO HD) support
* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
* Funded by BBC Research & Development
*
* This file is part of FFmpeg.
*
@ -36,9 +37,9 @@ struct DVDemuxContext {
const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
AVFormatContext* fctx;
AVStream* vst;
AVStream* ast[2];
AVPacket audio_pkt[2];
uint8_t audio_buf[2][8192];
AVStream* ast[4];
AVPacket audio_pkt[4];
uint8_t audio_buf[4][8192];
int ach;
int frames;
uint64_t abytes;
@ -98,12 +99,13 @@ static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
* 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
* are converted into 16bit linear ones.
*/
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2,
static int dv_extract_audio(uint8_t* frame, uint8_t* ppcm[4],
const DVprofile *sys)
{
int size, chan, i, j, d, of, smpls, freq, quant, half_ch;
uint16_t lc, rc;
const uint8_t* as_pack;
uint8_t *pcm, ipcm;
as_pack = dv_extract_pack(frame, dv_audio_source);
if (!as_pack) /* No audio ? */
@ -119,6 +121,10 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2,
size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
half_ch = sys->difseg_size/2;
/* We work with 720p frames split in half, thus even frames have channels 0,1 and odd 2,3 */
ipcm = (sys->height == 720 && ((frame[1]>>2)&0x3) == 0)?2:0;
pcm = ppcm[ipcm++];
/* for each DIF channel */
for (chan = 0; chan < sys->n_difchan; chan++) {
/* for each DIF segment */
@ -126,10 +132,9 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2,
frame += 6 * 80; /* skip DIF segment header */
if (quant == 1 && i == half_ch) {
/* next stereo channel (12bit mode only) */
if (!pcm2)
pcm = ppcm[ipcm++];
if (!pcm)
break;
else
pcm = pcm2;
}
/* for each AV sequence */
@ -170,10 +175,10 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2,
}
}
/* next stereo channel (50Mbps only) */
if(!pcm2)
/* next stereo channel (50Mbps and 100Mbps only) */
pcm = ppcm[ipcm++];
if (!pcm)
break;
pcm = pcm2;
}
return size;
@ -196,6 +201,9 @@ static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
/* note: ach counts PAIRS of channels (i.e. stereo channels) */
if (stype == 3) {
ach = 4;
} else
ach = (stype == 2 || (quant && (freq == 2))) ? 2 : 1;
/* Dynamic handling of the audio streams in DV */
@ -310,6 +318,7 @@ int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
uint8_t* buf, int buf_size)
{
int size, i;
uint8_t *ppcm[4] = {0};
if (buf_size < DV_PROFILE_BYTES ||
!(c->sys = dv_frame_profile(buf)) ||
@ -323,10 +332,19 @@ int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
for (i=0; i<c->ach; i++) {
c->audio_pkt[i].size = size;
c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate;
ppcm[i] = c->audio_buf[i];
}
dv_extract_audio(buf, c->audio_buf[0], c->audio_buf[1], c->sys);
dv_extract_audio(buf, ppcm, c->sys);
c->abytes += size;
/* We work with 720p frames split in half, thus even frames have channels 0,1 and odd 2,3 */
if (c->sys->height == 720) {
if (((buf[1]>>2)&0x3))
c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
else
c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
}
/* Now it's time to return video packet */
size = dv_extract_video_info(c, buf);
av_init_packet(pkt);
@ -366,6 +384,7 @@ void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
c->ast[0]->codec->bit_rate * (int64_t)c->sys->frame_rate_base,
8*c->sys->frame_rate);
c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
}
/************************************************************
@ -391,6 +410,11 @@ static int dv_read_header(AVFormatContext *s,
return AVERROR(EIO);
c->dv_demux->sys = dv_frame_profile(c->buf);
if (!c->dv_demux->sys) {
av_log(s, AV_LOG_ERROR, "Can't determine profile of DV input stream.\n");
return -1;
}
s->bit_rate = av_rescale(c->dv_demux->sys->frame_size * 8,
c->dv_demux->sys->frame_rate,
c->dv_demux->sys->frame_rate_base);