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FFmpeg/libavformat/jvdec.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* 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 "libavutil/mem.h"
#include "avformat.h"
#include "demux.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) */
uint16_t palette_size; /**< palette size (bytes) */
uint8_t 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;
FFStream *asti;
int64_t audio_pts = 0;
int64_t offset;
avio_skip(pb, 80);
ast = avformat_new_stream(s, NULL);
vst = avformat_new_stream(s, NULL);
if (!ast || !vst)
return AVERROR(ENOMEM);
asti = ffstream(ast);
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 =
asti->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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
avio_skip(pb, 10);
asti->index_entries = av_malloc(asti->nb_index_entries *
sizeof(*asti->index_entries));
if (!asti->index_entries)
return AVERROR(ENOMEM);
jv->frames = av_malloc(asti->nb_index_entries * sizeof(*jv->frames));
if (!jv->frames)
return AVERROR(ENOMEM);
offset = 0x68 + asti->nb_index_entries * 16;
for (int i = 0; i < asti->nb_index_entries; i++) {
AVIndexEntry *e = asti->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)
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];
FFStream *const asti = ffstream(ast);
int ret;
while (!avio_feof(s->pb) && jv->pts < asti->nb_index_entries) {
const AVIndexEntry *const e = asti->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];
FFStream *const asti = ffstream(ast);
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 >= asti->nb_index_entries)
return 0;
if (avio_seek(s->pb, asti->index_entries[i].pos, SEEK_SET) < 0)
return -1;
jv->state = JV_AUDIO;
jv->pts = i;
return 0;
}
const FFInputFormat ff_jv_demuxer = {
.p.name = "jv",
.p.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
.priv_data_size = sizeof(JVDemuxContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = read_probe,
.read_header = read_header,
.read_packet = read_packet,
.read_seek = read_seek,
.read_close = read_close,
};
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