* of DV technical info.
*
* Raw DV format
- * Copyright (c) 2002 Fabrice Bellard.
+ * Copyright (c) 2002 Fabrice Bellard
*
* 50 Mbps (DVCPRO50) and 100 Mbps (DVCPRO HD) support
* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
#include <time.h>
#include "avformat.h"
#include "libavcodec/dvdata.h"
+#include "libavutil/intreadwrite.h"
#include "dv.h"
struct DVDemuxContext {
const DVprofile* 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;
+ 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;
+ shift = (sample & 0xf00) >> 8;
if (shift < 0x2 || shift > 0xd) {
result = sample;
switch (t) {
case dv_audio_source:
- offs = (80*6 + 80*16*3 + 3);
- break;
+ offs = (80*6 + 80*16*3 + 3);
+ break;
case dv_audio_control:
- offs = (80*6 + 80*16*4 + 3);
- break;
+ offs = (80*6 + 80*16*4 + 3);
+ break;
case dv_video_control:
- offs = (80*5 + 48 + 5);
- break;
+ offs = (80*5 + 48 + 5);
+ break;
default:
- return NULL;
+ return NULL;
}
return frame[offs] == t ? &frame[offs] : NULL;
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 - 16bit linear, 1 - 12bit nonlinear */
+ 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 - 16bit linear, 1 - 12bit nonlinear */
if (quant > 1)
return -1; /* unsupported quantization */
size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
- half_ch = sys->difseg_size/2;
+ 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;
- pcm = ppcm[ipcm++];
+ * channels 0,1 and odd 2,3. */
+ ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0;
+ pcm = ppcm[ipcm++];
/* for each DIF channel */
for (chan = 0; chan < sys->n_difchan; chan++) {
for (j = 0; j < 9; j++) {
for (d = 8; d < 80; d += 2) {
if (quant == 0) { /* 16bit quantization */
- of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
+ of = sys->audio_shuffle[i][j] + (d - 8) / 2 * sys->audio_stride;
if (of*2 >= size)
continue;
if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
pcm[of*2+1] = 0;
} else { /* 12bit quantization */
- lc = ((uint16_t)frame[d] << 4) |
+ 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;
+ of = sys->audio_shuffle[i%half_ch][j] + (d - 8) / 3 * sys->audio_stride;
if (of*2 >= size)
continue;
pcm[of*2] = lc & 0xff; // FIXME: maybe we have to admit
pcm[of*2+1] = lc >> 8; // that DV is a big-endian PCM
of = sys->audio_shuffle[i%half_ch+half_ch][j] +
- (d - 8)/3 * sys->audio_stride;
+ (d - 8) / 3 * sys->audio_stride;
pcm[of*2] = rc & 0xff; // FIXME: maybe we have to admit
pcm[of*2+1] = rc >> 8; // that DV is a big-endian PCM
++d;
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 - 16bit linear, 1 - 12bit nonlinear */
+ 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 - 16bit linear, 1 - 12bit nonlinear */
/* note: ach counts PAIRS of channels (i.e. stereo channels) */
ach = ((int[4]){ 1, 0, 2, 4})[stype];
ach = 2;
/* Dynamic handling of the audio streams in DV */
- for (i=0; i<ach; i++) {
+ for (i = 0; i < ach; i++) {
if (!c->ast[i]) {
c->ast[i] = av_new_stream(c->fctx, 0);
if (!c->ast[i])
break;
av_set_pts_info(c->ast[i], 64, 1, 30000);
c->ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
- c->ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
+ c->ast[i]->codec->codec_id = 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].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 |= PKT_FLAG_KEY;
+ c->audio_pkt[i].flags |= PKT_FLAG_KEY;
}
c->ast[i]->codec->sample_rate = dv_audio_frequency[freq];
- c->ast[i]->codec->channels = 2;
- c->ast[i]->codec->bit_rate = 2 * dv_audio_frequency[freq] * 16;
- c->ast[i]->start_time = 0;
+ c->ast[i]->codec->channels = 2;
+ c->ast[i]->codec->bit_rate = 2 * dv_audio_frequency[freq] * 16;
+ c->ast[i]->start_time = 0;
}
c->ach = i;
if (c->sys) {
avctx = c->vst->codec;
- av_set_pts_info(c->vst, 64, c->sys->time_base.num, c->sys->time_base.den);
+ av_set_pts_info(c->vst, 64, c->sys->time_base.num,
+ c->sys->time_base.den);
avctx->time_base= c->sys->time_base;
- if(!avctx->width){
+ if (!avctx->width){
avctx->width = c->sys->width;
avctx->height = c->sys->height;
}
/* 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)));
+ 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];
avctx->bit_rate = av_rescale_q(c->sys->frame_size, (AVRational){8,1},
c->sys->time_base);
return NULL;
}
- c->sys = NULL;
+ c->sys = NULL;
c->fctx = s;
memset(c->ast, 0, sizeof(c->ast));
- c->ach = 0;
+ c->ach = 0;
c->frames = 0;
c->abytes = 0;
c->vst->codec->codec_type = CODEC_TYPE_VIDEO;
- c->vst->codec->codec_id = CODEC_ID_DVVIDEO;
- c->vst->codec->bit_rate = 25000000;
- c->vst->start_time = 0;
+ c->vst->codec->codec_id = CODEC_ID_DVVIDEO;
+ c->vst->codec->bit_rate = 25000000;
+ c->vst->start_time = 0;
return c;
}
int size = -1;
int i;
- for (i=0; i<c->ach; 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;
/* 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++) {
+ 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];
/* 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)
+ 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;
/* Now it's time to return video packet */
size = dv_extract_video_info(c, buf);
av_init_packet(pkt);
- pkt->data = buf;
- pkt->size = size;
- pkt->flags |= PKT_FLAG_KEY;
+ pkt->data = buf;
+ pkt->size = size;
+ pkt->flags |= PKT_FLAG_KEY;
pkt->stream_index = c->vst->id;
- pkt->pts = c->frames;
+ pkt->pts = c->frames;
c->frames++;
static int dv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
+ unsigned state;
RawDVContext *c = s->priv_data;
c->dv_demux = dv_init_demux(s);
if (!c->dv_demux)
return -1;
- if (get_buffer(s->pb, c->buf, DV_PROFILE_BYTES) <= 0 ||
+ state = get_be32(s->pb);
+ while ((state & 0xffffff7f) != 0x1f07003f) {
+ if (url_feof(s->pb)) {
+ av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
+ return -1;
+ }
+ state = (state << 8) | get_byte(s->pb);
+ }
+ AV_WB32(c->buf, state);
+
+ if (get_buffer(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) <= 0 ||
url_fseek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0)
return AVERROR(EIO);
size = dv_get_packet(c->dv_demux, pkt);
if (size < 0) {
+ if (!c->dv_demux->sys)
+ return AVERROR(EIO);
size = c->dv_demux->sys->frame_size;
if (get_buffer(s->pb, c->buf, size) <= 0)
return AVERROR(EIO);
static int dv_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
- RawDVContext *r = s->priv_data;
+ RawDVContext *r = s->priv_data;
DVDemuxContext *c = r->dv_demux;
- int64_t offset= dv_frame_offset(s, c, timestamp, flags);
+ int64_t offset = dv_frame_offset(s, c, timestamp, flags);
dv_offset_reset(c, offset / c->sys->frame_size);
offset = url_fseek(s->pb, offset, SEEK_SET);
- return (offset < 0)?offset:0;
+ return (offset < 0) ? offset : 0;
}
static int dv_read_close(AVFormatContext *s)
return 0;
}
-#ifdef CONFIG_DV_DEMUXER
+static int dv_probe(AVProbeData *p)
+{
+ unsigned state;
+ int i;
+
+ if (p->buf_size < 5)
+ return 0;
+
+ state = AV_RB32(p->buf);
+ for (i = 4; i < p->buf_size; i++) {
+ if ((state & 0xffffff7f) == 0x1f07003f)
+ return AVPROBE_SCORE_MAX*3/4; // not max to avoid dv in mov to match
+ state = (state << 8) | p->buf[i];
+ }
+
+ return 0;
+}
+
+#if CONFIG_DV_DEMUXER
AVInputFormat dv_demuxer = {
"dv",
NULL_IF_CONFIG_SMALL("DV video format"),
sizeof(RawDVContext),
- NULL,
+ dv_probe,
dv_read_header,
dv_read_packet,
dv_read_close,
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