mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
c1e439d7e9
It is not uncommon to find code where the caller thinks to know better what the return value should be than the callee. E.g. something like "if (av_new_packet(pkt, size) < 0) return AVERROR(ENOMEM);". This commit changes several instances of this to instead forward the actual error. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
267 lines
7.9 KiB
C
267 lines
7.9 KiB
C
/*
|
|
* Bitmap Brothers JV demuxer
|
|
* Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Bitmap Brothers JV demuxer
|
|
* @author Peter Ross <pross@xvid.org>
|
|
*/
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
#define JV_PREAMBLE_SIZE 5
|
|
|
|
typedef struct JVFrame {
|
|
int audio_size; /**< audio packet size (bytes) */
|
|
int video_size; /**< video packet size (bytes) */
|
|
int palette_size; /**< palette size (bytes) */
|
|
int video_type; /**< per-frame video compression type */
|
|
} JVFrame;
|
|
|
|
typedef struct JVDemuxContext {
|
|
JVFrame *frames;
|
|
enum {
|
|
JV_AUDIO = 0,
|
|
JV_VIDEO,
|
|
JV_PADDING
|
|
} state;
|
|
int64_t pts;
|
|
} JVDemuxContext;
|
|
|
|
#define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
|
|
|
|
static int read_probe(const AVProbeData *pd)
|
|
{
|
|
if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) + 4 <= pd->buf_size &&
|
|
!memcmp(pd->buf + 4, MAGIC, strlen(MAGIC)))
|
|
return AVPROBE_SCORE_MAX;
|
|
return 0;
|
|
}
|
|
|
|
static int read_close(AVFormatContext *s)
|
|
{
|
|
JVDemuxContext *jv = s->priv_data;
|
|
|
|
av_freep(&jv->frames);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_header(AVFormatContext *s)
|
|
{
|
|
JVDemuxContext *jv = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *vst, *ast;
|
|
int64_t audio_pts = 0;
|
|
int64_t offset;
|
|
int i;
|
|
|
|
avio_skip(pb, 80);
|
|
|
|
ast = avformat_new_stream(s, NULL);
|
|
vst = avformat_new_stream(s, NULL);
|
|
if (!ast || !vst)
|
|
return AVERROR(ENOMEM);
|
|
|
|
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
vst->codecpar->codec_id = AV_CODEC_ID_JV;
|
|
vst->codecpar->codec_tag = 0; /* no fourcc */
|
|
vst->codecpar->width = avio_rl16(pb);
|
|
vst->codecpar->height = avio_rl16(pb);
|
|
vst->duration =
|
|
vst->nb_frames =
|
|
ast->nb_index_entries = avio_rl16(pb);
|
|
avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000);
|
|
|
|
avio_skip(pb, 4);
|
|
|
|
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
|
|
ast->codecpar->codec_tag = 0; /* no fourcc */
|
|
ast->codecpar->sample_rate = avio_rl16(pb);
|
|
ast->codecpar->channels = 1;
|
|
ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
|
|
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
|
|
|
|
avio_skip(pb, 10);
|
|
|
|
ast->index_entries = av_malloc(ast->nb_index_entries *
|
|
sizeof(*ast->index_entries));
|
|
if (!ast->index_entries)
|
|
return AVERROR(ENOMEM);
|
|
|
|
jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame));
|
|
if (!jv->frames) {
|
|
av_freep(&ast->index_entries);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
offset = 0x68 + ast->nb_index_entries * 16;
|
|
for (i = 0; i < ast->nb_index_entries; i++) {
|
|
AVIndexEntry *e = ast->index_entries + i;
|
|
JVFrame *jvf = jv->frames + i;
|
|
|
|
/* total frame size including audio, video, palette data and padding */
|
|
e->size = avio_rl32(pb);
|
|
e->timestamp = i;
|
|
e->pos = offset;
|
|
offset += e->size;
|
|
|
|
jvf->audio_size = avio_rl32(pb);
|
|
jvf->video_size = avio_rl32(pb);
|
|
jvf->palette_size = avio_r8(pb) ? 768 : 0;
|
|
|
|
if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF ||
|
|
e->size - jvf->audio_size
|
|
- jvf->video_size
|
|
- jvf->palette_size < 0) {
|
|
if (s->error_recognition & AV_EF_EXPLODE) {
|
|
read_close(s);
|
|
av_freep(&jv->frames);
|
|
av_freep(&ast->index_entries);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
jvf->audio_size =
|
|
jvf->video_size =
|
|
jvf->palette_size = 0;
|
|
}
|
|
|
|
if (avio_r8(pb))
|
|
av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
|
|
|
|
jvf->video_type = avio_r8(pb);
|
|
avio_skip(pb, 1);
|
|
|
|
e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
|
|
audio_pts += jvf->audio_size;
|
|
|
|
e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
|
|
}
|
|
|
|
jv->state = JV_AUDIO;
|
|
return 0;
|
|
}
|
|
|
|
static int read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
JVDemuxContext *jv = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *ast = s->streams[0];
|
|
int ret;
|
|
|
|
while (!avio_feof(s->pb) && jv->pts < ast->nb_index_entries) {
|
|
const AVIndexEntry *e = ast->index_entries + jv->pts;
|
|
const JVFrame *jvf = jv->frames + jv->pts;
|
|
|
|
switch (jv->state) {
|
|
case JV_AUDIO:
|
|
jv->state++;
|
|
if (jvf->audio_size) {
|
|
if ((ret = av_get_packet(s->pb, pkt, jvf->audio_size)) < 0)
|
|
return ret;
|
|
pkt->stream_index = 0;
|
|
pkt->pts = e->timestamp;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
return 0;
|
|
}
|
|
case JV_VIDEO:
|
|
jv->state++;
|
|
if (jvf->video_size || jvf->palette_size) {
|
|
int size = jvf->video_size + jvf->palette_size;
|
|
if ((ret = av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) < 0)
|
|
return ret;
|
|
|
|
AV_WL32(pkt->data, jvf->video_size);
|
|
pkt->data[4] = jvf->video_type;
|
|
ret = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < size) {
|
|
memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0,
|
|
AV_INPUT_BUFFER_PADDING_SIZE);
|
|
pkt->flags |= AV_PKT_FLAG_CORRUPT;
|
|
}
|
|
pkt->size = ret + JV_PREAMBLE_SIZE;
|
|
pkt->stream_index = 1;
|
|
pkt->pts = jv->pts;
|
|
if (jvf->video_type != 1)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
return 0;
|
|
}
|
|
case JV_PADDING:
|
|
avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
|
|
- jvf->palette_size, 0));
|
|
jv->state = JV_AUDIO;
|
|
jv->pts++;
|
|
}
|
|
}
|
|
|
|
if (s->pb->eof_reached)
|
|
return AVERROR_EOF;
|
|
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
static int read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t ts, int flags)
|
|
{
|
|
JVDemuxContext *jv = s->priv_data;
|
|
AVStream *ast = s->streams[0];
|
|
int i;
|
|
|
|
if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
|
|
return AVERROR(ENOSYS);
|
|
|
|
switch (stream_index) {
|
|
case 0:
|
|
i = av_index_search_timestamp(ast, ts, flags);
|
|
break;
|
|
case 1:
|
|
i = ts;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (i < 0 || i >= ast->nb_index_entries)
|
|
return 0;
|
|
if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0)
|
|
return -1;
|
|
|
|
jv->state = JV_AUDIO;
|
|
jv->pts = i;
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_jv_demuxer = {
|
|
.name = "jv",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
|
|
.priv_data_size = sizeof(JVDemuxContext),
|
|
.read_probe = read_probe,
|
|
.read_header = read_header,
|
|
.read_packet = read_packet,
|
|
.read_seek = read_seek,
|
|
.read_close = read_close,
|
|
};
|