mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 14:18:25 -05:00
653 lines
20 KiB
C
Executable File
653 lines
20 KiB
C
Executable File
/*
|
|
* General DV demuxer
|
|
* Copyright (c) 2003 Roman Shaposhnik
|
|
*
|
|
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
|
|
* of DV technical info.
|
|
*
|
|
* Raw DV format
|
|
* Copyright (c) 2002 Fabrice Bellard
|
|
*
|
|
* 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.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* 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
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include <time.h>
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "libavcodec/dv_profile.h"
|
|
#include "libavcodec/dv.h"
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/mathematics.h"
|
|
#include "libavutil/timecode.h"
|
|
#include "dv.h"
|
|
#include "libavutil/avassert.h"
|
|
|
|
struct DVDemuxContext {
|
|
const AVDVProfile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
|
|
AVFormatContext* fctx;
|
|
AVStream* vst;
|
|
AVStream* ast[4];
|
|
AVPacket audio_pkt[4];
|
|
uint8_t audio_buf[4][8192];
|
|
int ach;
|
|
int frames;
|
|
uint64_t abytes;
|
|
};
|
|
|
|
static inline uint16_t dv_audio_12to16(uint16_t sample)
|
|
{
|
|
uint16_t shift, result;
|
|
|
|
sample = (sample < 0x800) ? sample : sample | 0xf000;
|
|
shift = (sample & 0xf00) >> 8;
|
|
|
|
if (shift < 0x2 || shift > 0xd) {
|
|
result = sample;
|
|
} else if (shift < 0x8) {
|
|
shift--;
|
|
result = (sample - (256 * shift)) << shift;
|
|
} else {
|
|
shift = 0xe - shift;
|
|
result = ((sample + ((256 * shift) + 1)) << shift) - 1;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static const uint8_t *dv_extract_pack(const uint8_t *frame, enum dv_pack_type t)
|
|
{
|
|
int offs;
|
|
int c;
|
|
|
|
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;
|
|
}
|
|
|
|
return frame[offs] == t ? &frame[offs] : NULL;
|
|
}
|
|
|
|
static const int dv_audio_frequency[3] = {
|
|
48000, 44100, 32000,
|
|
};
|
|
|
|
/*
|
|
* There's a couple of assumptions being made here:
|
|
* 1. By default we silence erroneous (0x8000/16-bit 0x800/12-bit) audio samples.
|
|
* We can pass them upwards when libavcodec will be ready to deal with them.
|
|
* 2. We don't do software emphasis.
|
|
* 3. Audio is always returned as 16-bit linear samples: 12-bit nonlinear samples
|
|
* are converted into 16-bit linear ones.
|
|
*/
|
|
static int dv_extract_audio(const uint8_t *frame, uint8_t **ppcm,
|
|
const AVDVProfile *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 ? */
|
|
return 0;
|
|
|
|
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
|
|
freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
|
|
quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
|
|
|
|
if (quant > 1)
|
|
return -1; /* unsupported quantization */
|
|
|
|
if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
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] & 0x0C)) ? 2 : 0;
|
|
|
|
if (ipcm + sys->n_difchan > (quant == 1 ? 2 : 4)) {
|
|
av_log(NULL, AV_LOG_ERROR, "too many dv pcm frames\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* for each DIF channel */
|
|
for (chan = 0; chan < sys->n_difchan; chan++) {
|
|
av_assert0(ipcm<4);
|
|
pcm = ppcm[ipcm++];
|
|
if (!pcm)
|
|
break;
|
|
|
|
/* 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) {
|
|
/* next stereo channel (12-bit mode only) */
|
|
av_assert0(ipcm<4);
|
|
pcm = ppcm[ipcm++];
|
|
if (!pcm)
|
|
break;
|
|
}
|
|
|
|
/* for each AV sequence */
|
|
for (j = 0; j < 9; j++) {
|
|
for (d = 8; d < 80; d += 2) {
|
|
if (quant == 0) { /* 16-bit quantization */
|
|
of = sys->audio_shuffle[i][j] +
|
|
(d - 8) / 2 * sys->audio_stride;
|
|
if (of * 2 >= size)
|
|
continue;
|
|
|
|
/* 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;
|
|
} else { /* 12-bit quantization */
|
|
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);
|
|
lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
|
|
rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
|
|
|
|
of = sys->audio_shuffle[i % half_ch][j] +
|
|
(d - 8) / 3 * sys->audio_stride;
|
|
if (of * 2 >= size)
|
|
continue;
|
|
|
|
/* 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;
|
|
++d;
|
|
}
|
|
}
|
|
|
|
frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
|
|
}
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static int dv_extract_audio_info(DVDemuxContext *c, const uint8_t *frame)
|
|
{
|
|
const uint8_t *as_pack;
|
|
int freq, stype, smpls, quant, i, ach;
|
|
|
|
as_pack = dv_extract_pack(frame, dv_audio_source);
|
|
if (!as_pack || !c->sys) { /* No audio ? */
|
|
c->ach = 0;
|
|
return 0;
|
|
}
|
|
|
|
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 */
|
|
quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
|
|
|
|
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;
|
|
}
|
|
|
|
if (stype > 3) {
|
|
av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype);
|
|
c->ach = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* note: ach counts PAIRS of channels (i.e. stereo channels) */
|
|
ach = ((int[4]) { 1, 0, 2, 4 })[stype];
|
|
if (ach == 1 && quant && freq == 2)
|
|
ach = 2;
|
|
|
|
/* Dynamic handling of the audio streams in DV */
|
|
for (i = 0; i < ach; i++) {
|
|
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);
|
|
c->ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
c->ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
|
|
|
|
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;
|
|
}
|
|
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;
|
|
c->ast[i]->start_time = 0;
|
|
}
|
|
c->ach = i;
|
|
|
|
return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
|
|
}
|
|
|
|
static int dv_extract_video_info(DVDemuxContext *c, const uint8_t *frame)
|
|
{
|
|
const uint8_t *vsc_pack;
|
|
AVCodecParameters *par;
|
|
int apt, is16_9;
|
|
|
|
par = c->vst->codecpar;
|
|
|
|
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];
|
|
par->bit_rate = av_rescale_q(c->sys->frame_size,
|
|
(AVRational) { 8, 1 },
|
|
c->sys->time_base);
|
|
return c->sys->frame_size;
|
|
}
|
|
|
|
static int dv_extract_timecode(DVDemuxContext* c, const uint8_t* frame, char *tc)
|
|
{
|
|
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.
|
|
int prevent_df = c->sys->ltc_divisor == 25 || c->sys->ltc_divisor == 50;
|
|
|
|
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);
|
|
return 1;
|
|
}
|
|
|
|
/* The following 3 functions constitute our interface to the world */
|
|
|
|
DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
|
|
{
|
|
DVDemuxContext *c;
|
|
|
|
c = av_mallocz(sizeof(DVDemuxContext));
|
|
if (!c)
|
|
return NULL;
|
|
|
|
c->vst = avformat_new_stream(s, NULL);
|
|
if (!c->vst) {
|
|
av_free(c);
|
|
return NULL;
|
|
}
|
|
|
|
c->fctx = s;
|
|
c->vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
c->vst->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
|
|
c->vst->codecpar->bit_rate = 25000000;
|
|
c->vst->start_time = 0;
|
|
|
|
return c;
|
|
}
|
|
|
|
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
|
|
{
|
|
int size = -1;
|
|
int i;
|
|
|
|
for (i = 0; i < c->ach; i++) {
|
|
if (c->ast[i] && c->audio_pkt[i].size) {
|
|
*pkt = c->audio_pkt[i];
|
|
c->audio_pkt[i].size = 0;
|
|
size = pkt->size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
|
|
uint8_t *buf, int buf_size, int64_t pos)
|
|
{
|
|
int size, i;
|
|
uint8_t *ppcm[5] = { 0 };
|
|
|
|
if (buf_size < DV_PROFILE_BYTES ||
|
|
!(c->sys = av_dv_frame_profile(c->sys, buf, buf_size)) ||
|
|
buf_size < c->sys->frame_size) {
|
|
return -1; /* Broken frame, or not enough data */
|
|
}
|
|
|
|
/* Queueing audio packet */
|
|
/* FIXME: in case of no audio/bad audio we have to do something */
|
|
size = dv_extract_audio_info(c, buf);
|
|
for (i = 0; i < c->ach; i++) {
|
|
c->audio_pkt[i].pos = pos;
|
|
c->audio_pkt[i].size = size;
|
|
c->audio_pkt[i].pts = c->abytes * 30000 * 8 /
|
|
c->ast[i]->codecpar->bit_rate;
|
|
ppcm[i] = c->audio_buf[i];
|
|
}
|
|
if (c->ach)
|
|
dv_extract_audio(buf, ppcm, c->sys);
|
|
|
|
/* 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] & 0x0C) {
|
|
c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
|
|
} else {
|
|
c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
|
|
c->abytes += size;
|
|
}
|
|
} else {
|
|
c->abytes += size;
|
|
}
|
|
|
|
/* Now it's time to return video packet */
|
|
size = dv_extract_video_info(c, buf);
|
|
av_init_packet(pkt);
|
|
pkt->data = buf;
|
|
pkt->pos = pos;
|
|
pkt->size = size;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
pkt->stream_index = c->vst->index;
|
|
pkt->pts = c->frames;
|
|
|
|
c->frames++;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
// FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
|
|
const int frame_size = c->sys->frame_size;
|
|
int64_t offset;
|
|
int64_t size = avio_size(s->pb) - s->internal->data_offset;
|
|
int64_t max_offset = ((size - 1) / frame_size) * frame_size;
|
|
|
|
offset = frame_size * timestamp;
|
|
|
|
if (size >= 0 && offset > max_offset)
|
|
offset = max_offset;
|
|
else if (offset < 0)
|
|
offset = 0;
|
|
|
|
return offset + s->internal->data_offset;
|
|
}
|
|
|
|
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
|
|
{
|
|
c->frames = frame_offset;
|
|
if (c->ach) {
|
|
if (c->sys) {
|
|
c->abytes = av_rescale_q(c->frames, c->sys->time_base,
|
|
(AVRational) { 8, c->ast[0]->codecpar->bit_rate });
|
|
} else
|
|
av_log(c->fctx, AV_LOG_ERROR, "cannot adjust audio bytes\n");
|
|
}
|
|
c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
|
|
c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
|
|
}
|
|
|
|
/************************************************************
|
|
* Implementation of the easiest DV storage of all -- raw DV.
|
|
************************************************************/
|
|
|
|
typedef struct RawDVContext {
|
|
DVDemuxContext *dv_demux;
|
|
uint8_t buf[DV_MAX_FRAME_SIZE];
|
|
} RawDVContext;
|
|
|
|
static int dv_read_timecode(AVFormatContext *s) {
|
|
int ret;
|
|
char timecode[AV_TIMECODE_STR_SIZE];
|
|
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;
|
|
if (!partial_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
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);
|
|
else
|
|
av_log(s, AV_LOG_ERROR, "Detected timecode is invalid\n");
|
|
|
|
finish:
|
|
av_free(partial_frame);
|
|
avio_seek(s->pb, pos, SEEK_SET);
|
|
return ret;
|
|
}
|
|
|
|
static int dv_read_header(AVFormatContext *s)
|
|
{
|
|
unsigned state, marker_pos = 0;
|
|
RawDVContext *c = s->priv_data;
|
|
int ret;
|
|
|
|
c->dv_demux = avpriv_dv_init_demux(s);
|
|
if (!c->dv_demux)
|
|
return AVERROR(ENOMEM);
|
|
|
|
state = avio_rb32(s->pb);
|
|
while ((state & 0xffffff7f) != 0x1f07003f) {
|
|
if (avio_feof(s->pb)) {
|
|
av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
if (state == 0x003f0700 || state == 0xff3f0700)
|
|
marker_pos = avio_tell(s->pb);
|
|
if (state == 0xff3f0701 && avio_tell(s->pb) - marker_pos == 80) {
|
|
avio_seek(s->pb, -163, SEEK_CUR);
|
|
state = avio_rb32(s->pb);
|
|
break;
|
|
}
|
|
state = (state << 8) | avio_r8(s->pb);
|
|
}
|
|
AV_WB32(c->buf, state);
|
|
|
|
if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) != DV_PROFILE_BYTES - 4 ||
|
|
avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0) {
|
|
ret = AVERROR(EIO);
|
|
goto fail;
|
|
}
|
|
|
|
c->dv_demux->sys = av_dv_frame_profile(c->dv_demux->sys,
|
|
c->buf,
|
|
DV_PROFILE_BYTES);
|
|
if (!c->dv_demux->sys) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Can't determine profile of DV input stream.\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
|
|
s->bit_rate = av_rescale_q(c->dv_demux->sys->frame_size,
|
|
(AVRational) { 8, 1 },
|
|
c->dv_demux->sys->time_base);
|
|
|
|
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
|
|
dv_read_timecode(s);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
av_freep(&c->dv_demux);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int size;
|
|
RawDVContext *c = s->priv_data;
|
|
|
|
size = avpriv_dv_get_packet(c->dv_demux, pkt);
|
|
|
|
if (size < 0) {
|
|
int ret;
|
|
int64_t pos = avio_tell(s->pb);
|
|
if (!c->dv_demux->sys)
|
|
return AVERROR(EIO);
|
|
size = c->dv_demux->sys->frame_size;
|
|
ret = avio_read(s->pb, c->buf, size);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (ret == 0) {
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
size = avpriv_dv_produce_packet(c->dv_demux, pkt, c->buf, size, pos);
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static int dv_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
RawDVContext *r = s->priv_data;
|
|
DVDemuxContext *c = r->dv_demux;
|
|
int64_t offset = dv_frame_offset(s, c, timestamp, flags);
|
|
|
|
if (avio_seek(s->pb, offset, SEEK_SET) < 0)
|
|
return -1;
|
|
|
|
ff_dv_offset_reset(c, offset / c->sys->frame_size);
|
|
return 0;
|
|
}
|
|
|
|
static int dv_read_close(AVFormatContext *s)
|
|
{
|
|
RawDVContext *c = s->priv_data;
|
|
av_freep(&c->dv_demux);
|
|
return 0;
|
|
}
|
|
|
|
static int dv_probe(const AVProbeData *p)
|
|
{
|
|
unsigned marker_pos = 0;
|
|
int i;
|
|
int matches = 0;
|
|
int firstmatch = 0;
|
|
int secondary_matches = 0;
|
|
|
|
if (p->buf_size < 5)
|
|
return 0;
|
|
|
|
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++;
|
|
if ((state & 0xffffff7f) == 0x1f07003f) {
|
|
matches++;
|
|
if (!i)
|
|
firstmatch = 1;
|
|
}
|
|
}
|
|
if (state == 0x003f0700 || state == 0xff3f0700)
|
|
marker_pos = i;
|
|
if (state == 0xff3f0701 && i - marker_pos == 80)
|
|
matches++;
|
|
}
|
|
}
|
|
|
|
if (matches && p->buf_size / matches < 1024 * 1024) {
|
|
if (matches > 4 || firstmatch ||
|
|
(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;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_dv_demuxer = {
|
|
.name = "dv",
|
|
.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
|
|
.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,
|
|
.extensions = "dv,dif",
|
|
};
|