115329f1 |
/* |
dca7ba4b |
* General DV demuxer |
064cf251 |
* Copyright (c) 2003 Roman Shaposhnik |
7458ccbb |
*
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
* of DV technical info.
* |
f20dca40 |
* Raw DV format |
406792e7 |
* Copyright (c) 2002 Fabrice Bellard |
f20dca40 |
* |
f8007a14 |
* 50 Mbps (DVCPRO50) and 100 Mbps (DVCPRO HD) support |
0b297700 |
* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com> |
f8007a14 |
* Funded by BBC Research & Development |
0b297700 |
* |
b78e7197 |
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
f20dca40 |
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
b78e7197 |
* version 2.1 of the License, or (at your option) any later version. |
f20dca40 |
* |
b78e7197 |
* FFmpeg is distributed in the hope that it will be useful, |
f20dca40 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public |
b78e7197 |
* License along with FFmpeg; if not, write to the Free Software |
5509bffa |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
f20dca40 |
*/ |
7458ccbb |
#include <time.h> |
f20dca40 |
#include "avformat.h" |
c3f9ebf7 |
#include "internal.h" |
520c1ec6 |
#include "libavcodec/dv_profile.h" |
3cbe1126 |
#include "libavcodec/dv.h" |
d5ca70b1 |
#include "libavutil/channel_layout.h" |
67d44b84 |
#include "libavutil/intreadwrite.h" |
0ebcdf5c |
#include "libavutil/mathematics.h" |
11e5d3b9 |
#include "libavutil/timecode.h" |
ddaae6a9 |
#include "dv.h" |
88d84dd8 |
#include "libavutil/avassert.h" |
ddaae6a9 |
struct DVDemuxContext { |
f6ee61fb |
const AVDVProfile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */ |
f94036f1 |
AVFormatContext* fctx;
AVStream* vst;
AVStream* ast[4];
AVPacket audio_pkt[4];
uint8_t audio_buf[4][8192];
int ach;
int frames;
uint64_t abytes; |
ddaae6a9 |
}; |
f20dca40 |
|
7458ccbb |
static inline uint16_t dv_audio_12to16(uint16_t sample)
{
uint16_t shift, result; |
115329f1 |
|
7458ccbb |
sample = (sample < 0x800) ? sample : sample | 0xf000; |
f94036f1 |
shift = (sample & 0xf00) >> 8; |
7458ccbb |
if (shift < 0x2 || shift > 0xd) { |
bb270c08 |
result = sample; |
7458ccbb |
} else if (shift < 0x8) {
shift--; |
bb270c08 |
result = (sample - (256 * shift)) << shift; |
7458ccbb |
} else { |
fcc455ff |
shift = 0xe - shift; |
bb270c08 |
result = ((sample + ((256 * shift) + 1)) << shift) - 1; |
7458ccbb |
}
return result;
}
|
ab6f4fd4 |
static const uint8_t *dv_extract_pack(const uint8_t *frame, enum dv_pack_type t) |
7458ccbb |
{
int offs; |
88f038ac |
int c; |
115329f1 |
|
88f038ac |
for (c = 0; c < 10; c++) {
switch (t) {
case dv_audio_source:
if (c&1) offs = (80 * 6 + 80 * 16 * 0 + 3 + c*12000);
else offs = (80 * 6 + 80 * 16 * 3 + 3 + c*12000);
break;
case dv_audio_control:
if (c&1) offs = (80 * 6 + 80 * 16 * 1 + 3 + c*12000);
else offs = (80 * 6 + 80 * 16 * 4 + 3 + c*12000);
break;
case dv_video_control:
if (c&1) offs = (80 * 3 + 8 + c*12000);
else offs = (80 * 5 + 48 + 5 + c*12000);
break;
case dv_timecode:
offs = (80*1 + 3 + 3);
break;
default:
return NULL;
}
if (frame[offs] == t)
break; |
115329f1 |
} |
7458ccbb |
|
ccd425e7 |
return frame[offs] == t ? &frame[offs] : NULL; |
7458ccbb |
}
|
8dbdc2d8 |
static const int dv_audio_frequency[3] = {
48000, 44100, 32000,
};
|
115329f1 |
/* |
7458ccbb |
* There's a couple of assumptions being made here: |
41ed7ab4 |
* 1. By default we silence erroneous (0x8000/16-bit 0x800/12-bit) audio samples. |
2f5df0b1 |
* We can pass them upwards when libavcodec will be ready to deal with them. |
7458ccbb |
* 2. We don't do software emphasis. |
41ed7ab4 |
* 3. Audio is always returned as 16-bit linear samples: 12-bit nonlinear samples
* are converted into 16-bit linear ones. |
7458ccbb |
*/ |
ab6f4fd4 |
static int dv_extract_audio(const uint8_t *frame, uint8_t **ppcm, |
f6ee61fb |
const AVDVProfile *sys) |
7458ccbb |
{ |
0b297700 |
int size, chan, i, j, d, of, smpls, freq, quant, half_ch; |
7458ccbb |
uint16_t lc, rc; |
fcc455ff |
const uint8_t *as_pack; |
f8007a14 |
uint8_t *pcm, ipcm; |
115329f1 |
|
7458ccbb |
as_pack = dv_extract_pack(frame, dv_audio_source);
if (!as_pack) /* No audio ? */ |
bb270c08 |
return 0; |
115329f1 |
|
fcc455ff |
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */ |
41ed7ab4 |
quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */ |
115329f1 |
|
7458ccbb |
if (quant > 1) |
fcc455ff |
return -1; /* unsupported quantization */ |
7458ccbb |
|
0ab36879 |
if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency))
return AVERROR_INVALIDDATA;
|
fcc455ff |
size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */ |
f94036f1 |
half_ch = sys->difseg_size / 2; |
7458ccbb |
|
75f2c209 |
/* We work with 720p frames split in half, thus even frames have |
f94036f1 |
* channels 0,1 and odd 2,3. */
ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0; |
f8007a14 |
|
3669915e |
if (ipcm + sys->n_difchan > (quant == 1 ? 2 : 4)) {
av_log(NULL, AV_LOG_ERROR, "too many dv pcm frames\n");
return AVERROR_INVALIDDATA;
}
|
0b297700 |
/* for each DIF channel */
for (chan = 0; chan < sys->n_difchan; chan++) { |
88d84dd8 |
av_assert0(ipcm<4);
pcm = ppcm[ipcm++];
if (!pcm)
break; |
2d1c0dea |
|
0b297700 |
/* for each DIF segment */
for (i = 0; i < sys->difseg_size; i++) {
frame += 6 * 80; /* skip DIF segment header */
if (quant == 1 && i == half_ch) { |
41ed7ab4 |
/* next stereo channel (12-bit mode only) */ |
88d84dd8 |
av_assert0(ipcm<4); |
f8007a14 |
pcm = ppcm[ipcm++];
if (!pcm) |
0b297700 |
break;
} |
bb270c08 |
|
0b297700 |
/* for each AV sequence */
for (j = 0; j < 9; j++) {
for (d = 8; d < 80; d += 2) { |
41ed7ab4 |
if (quant == 0) { /* 16-bit quantization */ |
fcc455ff |
of = sys->audio_shuffle[i][j] +
(d - 8) / 2 * sys->audio_stride;
if (of * 2 >= size) |
0b297700 |
continue;
|
fcc455ff |
/* FIXME: maybe we have to admit that DV is a
* big-endian PCM */
pcm[of * 2] = frame[d + 1];
pcm[of * 2 + 1] = frame[d];
if (pcm[of * 2 + 1] == 0x80 && pcm[of * 2] == 0x00)
pcm[of * 2 + 1] = 0; |
41ed7ab4 |
} else { /* 12-bit quantization */ |
fcc455ff |
lc = ((uint16_t)frame[d] << 4) |
((uint16_t)frame[d + 2] >> 4);
rc = ((uint16_t)frame[d + 1] << 4) |
((uint16_t)frame[d + 2] & 0x0f); |
0b297700 |
lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
|
fcc455ff |
of = sys->audio_shuffle[i % half_ch][j] +
(d - 8) / 3 * sys->audio_stride;
if (of * 2 >= size) |
0b297700 |
continue;
|
fcc455ff |
/* FIXME: maybe we have to admit that DV is a
* big-endian PCM */
pcm[of * 2] = lc & 0xff;
pcm[of * 2 + 1] = lc >> 8;
of = sys->audio_shuffle[i % half_ch + half_ch][j] +
(d - 8) / 3 * sys->audio_stride;
/* FIXME: maybe we have to admit that DV is a
* big-endian PCM */
pcm[of * 2] = rc & 0xff;
pcm[of * 2 + 1] = rc >> 8; |
0b297700 |
++d;
}
}
frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
} |
7458ccbb |
}
}
return size;
}
|
ab6f4fd4 |
static int dv_extract_audio_info(DVDemuxContext *c, const uint8_t *frame) |
7458ccbb |
{ |
fcc455ff |
const uint8_t *as_pack; |
0b297700 |
int freq, stype, smpls, quant, i, ach; |
7458ccbb |
as_pack = dv_extract_pack(frame, dv_audio_source); |
0b297700 |
if (!as_pack || !c->sys) { /* No audio ? */ |
ddaae6a9 |
c->ach = 0; |
bb270c08 |
return 0; |
ddaae6a9 |
} |
115329f1 |
|
fcc455ff |
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
stype = as_pack[3] & 0x1f; /* 0 - 2CH, 2 - 4CH, 3 - 8CH */ |
41ed7ab4 |
quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */ |
0b297700 |
|
0ab36879 |
if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) {
av_log(c->fctx, AV_LOG_ERROR,
"Unrecognized audio sample rate index (%d)\n", freq);
return 0;
}
|
f9de136b |
if (stype > 3) {
av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype);
c->ach = 0;
return 0;
}
|
0b297700 |
/* note: ach counts PAIRS of channels (i.e. stereo channels) */ |
fcc455ff |
ach = ((int[4]) { 1, 0, 2, 4 })[stype]; |
a53621fc |
if (ach == 1 && quant && freq == 2)
ach = 2; |
50883632 |
/* Dynamic handling of the audio streams in DV */ |
f94036f1 |
for (i = 0; i < ach; i++) { |
ede4cedf |
if (!c->ast[i]) {
c->ast[i] = avformat_new_stream(c->fctx, NULL);
if (!c->ast[i])
break;
avpriv_set_pts_info(c->ast[i], 64, 1, 30000); |
9200514a |
c->ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
c->ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; |
ede4cedf |
av_init_packet(&c->audio_pkt[i]);
c->audio_pkt[i].size = 0;
c->audio_pkt[i].data = c->audio_buf[i];
c->audio_pkt[i].stream_index = c->ast[i]->index;
c->audio_pkt[i].flags |= AV_PKT_FLAG_KEY;
} |
9200514a |
c->ast[i]->codecpar->sample_rate = dv_audio_frequency[freq];
c->ast[i]->codecpar->channels = 2;
c->ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
c->ast[i]->codecpar->bit_rate = 2 * dv_audio_frequency[freq] * 16; |
fcc455ff |
c->ast[i]->start_time = 0; |
ddaae6a9 |
} |
50883632 |
c->ach = i; |
115329f1 |
|
fcc455ff |
return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */ |
7458ccbb |
}
|
ab6f4fd4 |
static int dv_extract_video_info(DVDemuxContext *c, const uint8_t *frame) |
7458ccbb |
{ |
fcc455ff |
const uint8_t *vsc_pack; |
6f69f7a8 |
AVCodecParameters *par; |
ddaae6a9 |
int apt, is16_9; |
115329f1 |
|
6f69f7a8 |
par = c->vst->codecpar; |
6c0cf11f |
avpriv_set_pts_info(c->vst, 64, c->sys->time_base.num,
c->sys->time_base.den);
c->vst->avg_frame_rate = av_inv_q(c->vst->time_base);
/* finding out SAR is a little bit messy */
vsc_pack = dv_extract_pack(frame, dv_video_control);
apt = frame[4] & 0x07;
is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
(!apt && (vsc_pack[2] & 0x07) == 0x07)));
c->vst->sample_aspect_ratio = c->sys->sar[is16_9]; |
6f69f7a8 |
par->bit_rate = av_rescale_q(c->sys->frame_size, |
6c0cf11f |
(AVRational) { 8, 1 },
c->sys->time_base); |
35ba5c42 |
return c->sys->frame_size; |
7458ccbb |
}
|
ab6f4fd4 |
static int dv_extract_timecode(DVDemuxContext* c, const uint8_t* frame, char *tc) |
357cb533 |
{
const uint8_t *tc_pack;
// For PAL systems, drop frame bit is replaced by an arbitrary
// bit so its value should not be considered. Drop frame timecode
// is only relevant for NTSC systems. |
11e5d3b9 |
int prevent_df = c->sys->ltc_divisor == 25 || c->sys->ltc_divisor == 50; |
357cb533 |
|
11e5d3b9 |
tc_pack = dv_extract_pack(frame, dv_timecode);
if (!tc_pack)
return 0;
av_timecode_make_smpte_tc_string(tc, AV_RB32(tc_pack + 1), prevent_df); |
357cb533 |
return 1;
}
|
fcc455ff |
/* The following 3 functions constitute our interface to the world */ |
7458ccbb |
|
fcc455ff |
DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s) |
7458ccbb |
{
DVDemuxContext *c;
c = av_mallocz(sizeof(DVDemuxContext));
if (!c)
return NULL;
|
3b3bbdd3 |
c->vst = avformat_new_stream(s, NULL); |
50883632 |
if (!c->vst) { |
115329f1 |
av_free(c); |
50883632 |
return NULL;
} |
9ee91c2f |
|
0a41f47d |
c->fctx = s; |
9200514a |
c->vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
c->vst->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
c->vst->codecpar->bit_rate = 25000000; |
f94036f1 |
c->vst->start_time = 0; |
115329f1 |
|
7458ccbb |
return c; |
f20dca40 |
}
|
ab88b25f |
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt) |
f20dca40 |
{ |
7458ccbb |
int size = -1; |
ddaae6a9 |
int i;
|
f94036f1 |
for (i = 0; i < c->ach; i++) { |
ede4cedf |
if (c->ast[i] && c->audio_pkt[i].size) { |
fcc455ff |
*pkt = c->audio_pkt[i]; |
ede4cedf |
c->audio_pkt[i].size = 0; |
fcc455ff |
size = pkt->size; |
ede4cedf |
break;
} |
425ed6e2 |
} |
7458ccbb |
return size;
}
|
ab88b25f |
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, |
7565aaec |
uint8_t *buf, int buf_size, int64_t pos) |
7458ccbb |
{ |
ddaae6a9 |
int size, i; |
7ee191ca |
uint8_t *ppcm[5] = { 0 }; |
115329f1 |
|
c4e7baa8 |
if (buf_size < DV_PROFILE_BYTES || |
f6ee61fb |
!(c->sys = av_dv_frame_profile(c->sys, buf, buf_size)) || |
c4e7baa8 |
buf_size < c->sys->frame_size) { |
ede4cedf |
return -1; /* Broken frame, or not enough data */ |
c4e7baa8 |
} |
7458ccbb |
/* Queueing audio packet */
/* FIXME: in case of no audio/bad audio we have to do something */ |
ddaae6a9 |
size = dv_extract_audio_info(c, buf); |
f94036f1 |
for (i = 0; i < c->ach; i++) { |
6f5f7f70 |
c->audio_pkt[i].pos = pos; |
ede4cedf |
c->audio_pkt[i].size = size; |
fcc455ff |
c->audio_pkt[i].pts = c->abytes * 30000 * 8 / |
9200514a |
c->ast[i]->codecpar->bit_rate; |
ede4cedf |
ppcm[i] = c->audio_buf[i]; |
ddaae6a9 |
} |
5cb57a16 |
if (c->ach)
dv_extract_audio(buf, ppcm, c->sys); |
115329f1 |
|
75f2c209 |
/* We work with 720p frames split in half, thus even frames have
* channels 0,1 and odd 2,3. */ |
f8007a14 |
if (c->sys->height == 720) { |
8a4ea200 |
if (buf[1] & 0x0C) { |
f8007a14 |
c->audio_pkt[2].size = c->audio_pkt[3].size = 0; |
8a4ea200 |
} else { |
f8007a14 |
c->audio_pkt[0].size = c->audio_pkt[1].size = 0; |
fcc455ff |
c->abytes += size; |
8a4ea200 |
}
} else {
c->abytes += size; |
f8007a14 |
}
|
7458ccbb |
/* Now it's time to return video packet */ |
ddaae6a9 |
size = dv_extract_video_info(c, buf); |
ec820113 |
av_init_packet(pkt); |
f94036f1 |
pkt->data = buf; |
148ffcd2 |
pkt->pos = pos; |
f94036f1 |
pkt->size = size; |
cc947f04 |
pkt->flags |= AV_PKT_FLAG_KEY; |
14f031d7 |
pkt->stream_index = c->vst->index; |
f94036f1 |
pkt->pts = c->frames; |
115329f1 |
|
8066e59f |
c->frames++; |
ddaae6a9 |
|
7458ccbb |
return size;
} |
115329f1 |
|
83582de4 |
static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c, |
fcc455ff |
int64_t timestamp, int flags) |
8066e59f |
{ |
0bf4e2b8 |
// FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk) |
8284a4ba |
const int frame_size = c->sys->frame_size; |
eb1bde3e |
int64_t offset; |
9deaec78 |
int64_t size = avio_size(s->pb) - s->internal->data_offset; |
8284a4ba |
int64_t max_offset = ((size - 1) / frame_size) * frame_size; |
0bf4e2b8 |
|
8284a4ba |
offset = frame_size * timestamp; |
115329f1 |
|
fcc455ff |
if (size >= 0 && offset > max_offset)
offset = max_offset;
else if (offset < 0)
offset = 0; |
8066e59f |
|
9deaec78 |
return offset + s->internal->data_offset; |
8066e59f |
}
|
167f3b8d |
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset) |
664f5836 |
{ |
fcc455ff |
c->frames = frame_offset; |
a39c5c4c |
if (c->ach) {
if (c->sys) { |
fcc455ff |
c->abytes = av_rescale_q(c->frames, c->sys->time_base, |
9200514a |
(AVRational) { 8, c->ast[0]->codecpar->bit_rate }); |
7565aaec |
} else |
a39c5c4c |
av_log(c->fctx, AV_LOG_ERROR, "cannot adjust audio bytes\n");
} |
664f5836 |
c->audio_pkt[0].size = c->audio_pkt[1].size = 0; |
f8007a14 |
c->audio_pkt[2].size = c->audio_pkt[3].size = 0; |
664f5836 |
}
|
7458ccbb |
/************************************************************
* Implementation of the easiest DV storage of all -- raw DV.
************************************************************/ |
115329f1 |
|
7458ccbb |
typedef struct RawDVContext { |
fcc455ff |
DVDemuxContext *dv_demux; |
0b297700 |
uint8_t buf[DV_MAX_FRAME_SIZE]; |
7458ccbb |
} RawDVContext;
|
357cb533 |
static int dv_read_timecode(AVFormatContext *s) {
int ret; |
11e5d3b9 |
char timecode[AV_TIMECODE_STR_SIZE]; |
357cb533 |
int64_t pos = avio_tell(s->pb);
// Read 3 DIF blocks: Header block and 2 Subcode blocks.
int partial_frame_size = 3 * 80;
uint8_t *partial_frame = av_mallocz(sizeof(*partial_frame) *
partial_frame_size);
RawDVContext *c = s->priv_data; |
72d99c8c |
if (!partial_frame)
return AVERROR(ENOMEM);
|
357cb533 |
ret = avio_read(s->pb, partial_frame, partial_frame_size);
if (ret < 0)
goto finish;
if (ret < partial_frame_size) {
ret = -1;
goto finish;
}
ret = dv_extract_timecode(c->dv_demux, partial_frame, timecode);
if (ret)
av_dict_set(&s->metadata, "timecode", timecode, 0); |
d8173f26 |
else |
08277a45 |
av_log(s, AV_LOG_ERROR, "Detected timecode is invalid\n"); |
357cb533 |
finish:
av_free(partial_frame);
avio_seek(s->pb, pos, SEEK_SET);
return ret;
}
|
6e9651d1 |
static int dv_read_header(AVFormatContext *s) |
7458ccbb |
{ |
70606675 |
unsigned state, marker_pos = 0; |
7458ccbb |
RawDVContext *c = s->priv_data; |
0b297700 |
|
ab88b25f |
c->dv_demux = avpriv_dv_init_demux(s); |
c4e55470 |
if (!c->dv_demux)
return -1; |
115329f1 |
|
e63a3628 |
state = avio_rb32(s->pb); |
67d44b84 |
while ((state & 0xffffff7f) != 0x1f07003f) { |
d34ec64a |
if (avio_feof(s->pb)) { |
67d44b84 |
av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
return -1;
} |
70606675 |
if (state == 0x003f0700 || state == 0xff3f0700) |
384c9c2f |
marker_pos = avio_tell(s->pb);
if (state == 0xff3f0701 && avio_tell(s->pb) - marker_pos == 80) { |
f59d8ff8 |
avio_seek(s->pb, -163, SEEK_CUR); |
e63a3628 |
state = avio_rb32(s->pb); |
70606675 |
break;
} |
e63a3628 |
state = (state << 8) | avio_r8(s->pb); |
67d44b84 |
}
AV_WB32(c->buf, state);
|
b52bd2a4 |
if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) != DV_PROFILE_BYTES - 4 || |
f59d8ff8 |
avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0) |
6f3e0b21 |
return AVERROR(EIO); |
c4e55470 |
|
f6ee61fb |
c->dv_demux->sys = av_dv_frame_profile(c->dv_demux->sys,
c->buf,
DV_PROFILE_BYTES); |
f8007a14 |
if (!c->dv_demux->sys) { |
fcc455ff |
av_log(s, AV_LOG_ERROR,
"Can't determine profile of DV input stream.\n"); |
f8007a14 |
return -1;
}
|
fcc455ff |
s->bit_rate = av_rescale_q(c->dv_demux->sys->frame_size,
(AVRational) { 8, 1 }, |
4e92dabf |
c->dv_demux->sys->time_base); |
115329f1 |
|
4de591e6 |
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) |
357cb533 |
dv_read_timecode(s);
|
c4e55470 |
return 0; |
7458ccbb |
}
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int size; |
115329f1 |
RawDVContext *c = s->priv_data;
|
ab88b25f |
size = avpriv_dv_get_packet(c->dv_demux, pkt); |
115329f1 |
|
7458ccbb |
if (size < 0) { |
3eae98c1 |
int ret; |
148ffcd2 |
int64_t pos = avio_tell(s->pb); |
6d8b21f3 |
if (!c->dv_demux->sys)
return AVERROR(EIO); |
0b297700 |
size = c->dv_demux->sys->frame_size; |
3eae98c1 |
ret = avio_read(s->pb, c->buf, size);
if (ret < 0) {
return ret;
} else if (ret == 0) { |
6f3e0b21 |
return AVERROR(EIO); |
3eae98c1 |
} |
7458ccbb |
|
dd8ffc19 |
size = avpriv_dv_produce_packet(c->dv_demux, pkt, c->buf, size, pos); |
115329f1 |
}
|
7458ccbb |
return size; |
f20dca40 |
}
|
115329f1 |
static int dv_read_seek(AVFormatContext *s, int stream_index, |
fcc455ff |
int64_t timestamp, int flags) |
8066e59f |
{ |
f94036f1 |
RawDVContext *r = s->priv_data; |
83582de4 |
DVDemuxContext *c = r->dv_demux; |
f94036f1 |
int64_t offset = dv_frame_offset(s, c, timestamp, flags); |
83582de4 |
|
1df00ac8 |
if (avio_seek(s->pb, offset, SEEK_SET) < 0)
return -1; |
115329f1 |
|
167f3b8d |
ff_dv_offset_reset(c, offset / c->sys->frame_size); |
1df00ac8 |
return 0; |
8066e59f |
}
|
c18a2692 |
static int dv_read_close(AVFormatContext *s) |
f20dca40 |
{ |
7458ccbb |
RawDVContext *c = s->priv_data; |
4efdb29c |
av_freep(&c->dv_demux); |
f20dca40 |
return 0;
}
|
e34a5996 |
static int dv_probe(AVProbeData *p)
{ |
59ce62f7 |
unsigned marker_pos = 0; |
e34a5996 |
int i; |
fcc455ff |
int matches = 0; |
ef8f2934 |
int firstmatch = 0; |
f6765f3f |
int secondary_matches = 0; |
e34a5996 |
if (p->buf_size < 5)
return 0;
|
76a47d66 |
for (i = 0; i < p->buf_size-4; i++) {
unsigned state = AV_RB32(p->buf+i);
if ((state & 0x0007f840) == 0x00070000) {
// any section header, also with seq/chan num != 0,
// should appear around every 12000 bytes, at least 10 per frame
if ((state & 0xff07ff7f) == 0x1f07003f) {
secondary_matches++; |
ef8f2934 |
if ((state & 0xffffff7f) == 0x1f07003f) { |
76a47d66 |
matches++; |
ef8f2934 |
if (!i)
firstmatch = 1;
} |
76a47d66 |
}
if (state == 0x003f0700 || state == 0xff3f0700)
marker_pos = i;
if (state == 0xff3f0701 && i - marker_pos == 80)
matches++;
} |
e34a5996 |
}
|
fcc455ff |
if (matches && p->buf_size / matches < 1024 * 1024) { |
ef8f2934 |
if (matches > 4 || firstmatch || |
fcc455ff |
(secondary_matches >= 10 &&
p->buf_size / secondary_matches < 24000))
// not max to avoid dv in mov to match
return AVPROBE_SCORE_MAX * 3 / 4;
return AVPROBE_SCORE_MAX / 4; |
6377de61 |
} |
e34a5996 |
return 0;
}
|
66355be3 |
AVInputFormat ff_dv_demuxer = { |
dfc2c4d9 |
.name = "dv", |
0177b7d2 |
.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), |
dfc2c4d9 |
.priv_data_size = sizeof(RawDVContext),
.read_probe = dv_probe,
.read_header = dv_read_header,
.read_packet = dv_read_packet,
.read_close = dv_read_close,
.read_seek = dv_read_seek, |
20234a4b |
.extensions = "dv,dif", |
118e91f3 |
}; |