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-rw-r--r--libavformat/dv.c94
1 files changed, 79 insertions, 15 deletions
diff --git a/libavformat/dv.c b/libavformat/dv.c
index 1730972213..a04735ac25 100644
--- a/libavformat/dv.c
+++ b/libavformat/dv.c
@@ -12,20 +12,20 @@
* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
* Funded by BBC Research & Development
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * 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>
@@ -36,7 +36,9 @@
#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 DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
@@ -89,6 +91,9 @@ static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
case dv_video_control:
offs = (80*5 + 48 + 5);
break;
+ case dv_timecode:
+ offs = (80*1 + 3 + 3);
+ break;
default:
return NULL;
}
@@ -137,9 +142,14 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* ppcm[4],
* 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++) {
- /* next stereo channel (50Mbps and 100Mbps only) */
+ av_assert0(ipcm<4);
pcm = ppcm[ipcm++];
if (!pcm)
break;
@@ -149,6 +159,7 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* ppcm[4],
frame += 6 * 80; /* skip DIF segment header */
if (quant == 1 && i == half_ch) {
/* next stereo channel (12bit mode only) */
+ av_assert0(ipcm<4);
pcm = ppcm[ipcm++];
if (!pcm)
break;
@@ -269,11 +280,6 @@ static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
avpriv_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){
- avctx->width = c->sys->width;
- avctx->height = c->sys->height;
- }
- avctx->pix_fmt = c->sys->pix_fmt;
/* finding out SAR is a little bit messy */
vsc_pack = dv_extract_pack(frame, dv_video_control);
@@ -288,6 +294,22 @@ static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
return size;
}
+static int dv_extract_timecode(DVDemuxContext* c, 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
*/
@@ -333,7 +355,7 @@ int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
}
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
- uint8_t* buf, int buf_size)
+ uint8_t* buf, int buf_size, int64_t pos)
{
int size, i;
uint8_t *ppcm[4] = {0};
@@ -348,6 +370,7 @@ int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
/* 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]->codec->bit_rate;
ppcm[i] = c->audio_buf[i];
@@ -372,6 +395,7 @@ int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
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;
@@ -402,9 +426,13 @@ static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
{
c->frames= frame_offset;
- if (c->ach)
+ if (c->ach) {
+ if (c->sys) {
c->abytes= av_rescale_q(c->frames, c->sys->time_base,
(AVRational){8, c->ast[0]->codec->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;
}
@@ -418,6 +446,38 @@ typedef struct RawDVContext {
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;
+ 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;
@@ -429,7 +489,7 @@ static int dv_read_header(AVFormatContext *s)
state = avio_rb32(s->pb);
while ((state & 0xffffff7f) != 0x1f07003f) {
- if (s->pb->eof_reached) {
+ if (url_feof(s->pb)) {
av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
return -1;
}
@@ -444,7 +504,7 @@ static int dv_read_header(AVFormatContext *s)
}
AV_WB32(c->buf, state);
- if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) <= 0 ||
+ 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)
return AVERROR(EIO);
@@ -457,6 +517,9 @@ static int dv_read_header(AVFormatContext *s)
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)
+ dv_read_timecode(s);
+
return 0;
}
@@ -469,13 +532,14 @@ static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
size = avpriv_dv_get_packet(c->dv_demux, pkt);
if (size < 0) {
+ int64_t pos = avio_tell(s->pb);
if (!c->dv_demux->sys)
return AVERROR(EIO);
size = c->dv_demux->sys->frame_size;
if (avio_read(s->pb, c->buf, size) <= 0)
return AVERROR(EIO);
- size = avpriv_dv_produce_packet(c->dv_demux, pkt, c->buf, size);
+ size = avpriv_dv_produce_packet(c->dv_demux, pkt, c->buf, size, pos);
}
return size;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 21:16:57 +0000