RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

lavf/microdvd: rewrite using subtitles queue API.

This commit is contained in:
Clément Bœsch 2012-06-15 18:59:52 +02:00
parent 0ef28e119e
commit a19e9f2d5c
1 changed files with 61 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

153
libavformat/microdvddec.c
View File

@ -1,6 +1,7 @@
/*
* MicroDVD subtitle demuxer
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
* Copyright (c) 2012 Clément Bœsch <ubitux@gmail.com>
*
* This file is part of FFmpeg.
*
@ -21,16 +22,14 @@
#include "avformat.h"
#include "internal.h"
#include "subtitles.h"
#include "libavutil/intreadwrite.h"
#define MAX_LINESIZE 2048
typedef struct {
uint8_t lines[3][MAX_LINESIZE];
int64_t pos[3];
AVPacket last_pkt;
int last_pkt_ready;
FFDemuxSubtitlesQueue q;
} MicroDVDContext;
@ -52,36 +51,6 @@ static int microdvd_probe(AVProbeData *p)
return AVPROBE_SCORE_MAX;
}
static int microdvd_read_header(AVFormatContext *s)
{
AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */
MicroDVDContext *microdvd = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
int i, frame;
double fps;
char c;
if (!st)
return AVERROR(ENOMEM);
for (i=0; i<FF_ARRAY_ELEMS(microdvd->lines); i++) {
microdvd->pos[i] = avio_tell(s->pb);
ff_get_line(s->pb, microdvd->lines[i], sizeof(microdvd->lines[i]));
if ((sscanf(microdvd->lines[i], "{%d}{}%6lf", &frame, &fps) == 2 ||
sscanf(microdvd->lines[i], "{%d}{%*d}%6lf", &frame, &fps) == 2)
&& frame <= 1 && fps > 3 && fps < 100)
pts_info = av_d2q(fps, 100000);
if (sscanf(microdvd->lines[i], "{DEFAULT}{}%c", &c) == 1) {
st->codec->extradata = av_strdup(microdvd->lines[i] + 11);
st->codec->extradata_size = strlen(st->codec->extradata);
i--;
}
}
avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = CODEC_ID_MICRODVD;
return 0;
}
static int64_t get_pts(const char *buf)
{
int frame;
@ -101,68 +70,67 @@ static int get_duration(const char *buf)
return -1;
}
static int microdvd_read_header(AVFormatContext *s)
{
AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */
MicroDVDContext *microdvd = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
int i = 0;
char line[MAX_LINESIZE];
if (!st)
return AVERROR(ENOMEM);
while (!url_feof(s->pb)) {
AVPacket *sub;
int64_t pos = avio_tell(s->pb);
int len = ff_get_line(s->pb, line, sizeof(line));
if (!len)
break;
if (i < 3) {
int frame;
double fps;
char c;
i++;
if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 ||
sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2)
&& frame <= 1 && fps > 3 && fps < 100)
pts_info = av_d2q(fps, 100000);
if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
st->codec->extradata = av_strdup(line + 11);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = strlen(st->codec->extradata) + 1;
continue;
}
}
sub = ff_subtitles_queue_insert(&microdvd->q, line, len, 0);
if (!sub)
return AVERROR(ENOMEM);
sub->pos = pos;
sub->pts = get_pts(sub->data);
sub->duration = get_duration(sub->data);
}
ff_subtitles_queue_finalize(&microdvd->q);
avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = CODEC_ID_MICRODVD;
return 0;
}
static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)
{
MicroDVDContext *microdvd = s->priv_data;
char buffer[MAX_LINESIZE];
int64_t pos = avio_tell(s->pb);
int i, len = 0, res = AVERROR_EOF;
return ff_subtitles_queue_read_packet(&microdvd->q, pkt);
}
// last packet has its duration set but couldn't be raised earlier
if (microdvd->last_pkt_ready) {
*pkt = microdvd->last_pkt;
microdvd->last_pkt_ready = 0;
return 0;
}
for (i=0; i<FF_ARRAY_ELEMS(microdvd->lines); i++) {
if (microdvd->lines[i][0]) {
strcpy(buffer, microdvd->lines[i]);
pos = microdvd->pos[i];
len = strlen(buffer);
microdvd->lines[i][0] = 0;
break;
}
}
if (!len)
len = ff_get_line(s->pb, buffer, sizeof(buffer));
if (microdvd->last_pkt.duration == -1 && !buffer[0]) {
// if the previous subtitle line had no duration, last until the end of
// the presentation
microdvd->last_pkt.duration = 0;
*pkt = microdvd->last_pkt;
pkt->duration = -1;
res = 0;
} else if (buffer[0] && !(res = av_new_packet(pkt, len))) {
memcpy(pkt->data, buffer, len);
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->pos = pos;
pkt->pts = pkt->dts = get_pts(buffer);
if (pkt->pts != AV_NOPTS_VALUE) {
pkt->duration = get_duration(buffer);
if (microdvd->last_pkt.duration == -1) {
// previous packet wasn't raised because it was lacking the
// duration info, so set its duration with the new packet pts
// and raise it
AVPacket tmp_pkt;
tmp_pkt = microdvd->last_pkt;
tmp_pkt.duration = pkt->pts - tmp_pkt.pts;
microdvd->last_pkt = *pkt;
microdvd->last_pkt_ready = pkt->duration != -1;
*pkt = tmp_pkt;
} else if (pkt->duration == -1) {
// no packet without duration queued, and current one is
// lacking the duration info, we need to parse another subtitle
// event.
microdvd->last_pkt = *pkt;
res = AVERROR(EAGAIN);
}
}
}
return res;
static int microdvd_read_close(AVFormatContext *s)
{
MicroDVDContext *microdvd = s->priv_data;
ff_subtitles_queue_clean(&microdvd->q);
return 0;
}
AVInputFormat ff_microdvd_demuxer = {
@ -172,5 +140,6 @@ AVInputFormat ff_microdvd_demuxer = {
.read_probe = microdvd_probe,
.read_header = microdvd_read_header,
.read_packet = microdvd_read_packet,
.read_close = microdvd_read_close,
.flags = AVFMT_GENERIC_INDEX,
};