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FFmpeg/libavformat/jvdec.c
Andreas Rheinhardt c1e439d7e9 avformat: Forward errors where possible
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>
2019-12-12 19:25:33 +01:00

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,
};