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ffmpeg/libavformat/paf.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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/*
* Packed Animation File demuxer
* Copyright (c) 2012 Paul B Mahol
*
* 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
*/
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "libavcodec/paf.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a"
typedef struct PAFDemuxContext {
uint32_t buffer_size;
uint32_t frame_blks;
uint32_t nb_frames;
uint32_t start_offset;
uint32_t preload_count;
uint32_t max_video_blks;
uint32_t max_audio_blks;
uint32_t current_frame;
uint32_t current_frame_count;
uint32_t current_frame_block;
uint32_t *blocks_count_table;
uint32_t *frames_offset_table;
uint32_t *blocks_offset_table;
uint8_t *video_frame;
int video_size;
uint8_t *audio_frame;
uint8_t *temp_audio_frame;
int audio_size;
int got_audio;
} PAFDemuxContext;
static int read_probe(const AVProbeData *p)
{
if ((p->buf_size >= strlen(MAGIC)) &&
!memcmp(p->buf, MAGIC, strlen(MAGIC)))
return AVPROBE_SCORE_MAX;
return 0;
}
static int read_close(AVFormatContext *s)
{
PAFDemuxContext *p = s->priv_data;
av_freep(&p->blocks_count_table);
av_freep(&p->frames_offset_table);
av_freep(&p->blocks_offset_table);
av_freep(&p->video_frame);
av_freep(&p->audio_frame);
av_freep(&p->temp_audio_frame);
return 0;
}
static int read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
{
int i;
for (i = 0; i < count; i++) {
if (avio_feof(s->pb))
return AVERROR_INVALIDDATA;
table[i] = avio_rl32(s->pb);
}
avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
return 0;
}
static int read_header(AVFormatContext *s)
{
PAFDemuxContext *p = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *ast, *vst;
int frame_ms, ret = 0;
avio_skip(pb, 132);
vst = avformat_new_stream(s, 0);
if (!vst)
return AVERROR(ENOMEM);
vst->start_time = 0;
vst->nb_frames =
vst->duration =
p->nb_frames = avio_rl32(pb);
frame_ms = avio_rl32(pb);
if (frame_ms < 1)
return AVERROR_INVALIDDATA;
vst->codecpar->width = avio_rl32(pb);
vst->codecpar->height = avio_rl32(pb);
avio_skip(pb, 4);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_tag = 0;
vst->codecpar->codec_id = AV_CODEC_ID_PAF_VIDEO;
avpriv_set_pts_info(vst, 64, frame_ms, 1000);
ast = avformat_new_stream(s, 0);
if (!ast)
return AVERROR(ENOMEM);
ast->start_time = 0;
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_tag = 0;
ast->codecpar->codec_id = AV_CODEC_ID_PAF_AUDIO;
ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
ast->codecpar->sample_rate = 22050;
avpriv_set_pts_info(ast, 64, 1, 22050);
p->buffer_size = avio_rl32(pb);
p->preload_count = avio_rl32(pb);
p->frame_blks = avio_rl32(pb);
p->start_offset = avio_rl32(pb);
p->max_video_blks = avio_rl32(pb);
p->max_audio_blks = avio_rl32(pb);
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
if (p->buffer_size < 175 ||
p->max_audio_blks < 2 ||
p->max_video_blks < 1 ||
p->frame_blks < 1 ||
p->nb_frames < 1 ||
p->preload_count < 1 ||
p->buffer_size > 2048 ||
p->max_video_blks > 2048 ||
p->max_audio_blks > 2048 ||
p->nb_frames > INT_MAX / sizeof(uint32_t) ||
p->frame_blks > INT_MAX / sizeof(uint32_t))
return AVERROR_INVALIDDATA;
p->blocks_count_table = av_malloc_array(p->nb_frames,
sizeof(*p->blocks_count_table));
p->frames_offset_table = av_malloc_array(p->nb_frames,
sizeof(*p->frames_offset_table));
p->blocks_offset_table = av_malloc_array(p->frame_blks,
sizeof(*p->blocks_offset_table));
p->video_size = p->max_video_blks * p->buffer_size;
p->video_frame = av_mallocz(p->video_size);
p->audio_size = p->max_audio_blks * p->buffer_size;
p->audio_frame = av_mallocz(p->audio_size);
p->temp_audio_frame = av_mallocz(p->audio_size);
if (!p->blocks_count_table ||
!p->frames_offset_table ||
!p->blocks_offset_table ||
!p->video_frame ||
!p->audio_frame ||
!p->temp_audio_frame)
return AVERROR(ENOMEM);
avio_seek(pb, p->buffer_size, SEEK_SET);
ret = read_table(s, p->blocks_count_table, p->nb_frames);
if (ret < 0)
return ret;
ret = read_table(s, p->frames_offset_table, p->nb_frames);
if (ret < 0)
return ret;
ret = read_table(s, p->blocks_offset_table, p->frame_blks);
if (ret < 0)
return ret;
p->got_audio = 0;
p->current_frame = 0;
p->current_frame_block = 0;
avio_seek(pb, p->start_offset, SEEK_SET);
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
PAFDemuxContext *p = s->priv_data;
AVIOContext *pb = s->pb;
uint32_t count, offset;
int size, i, ret;
if (p->current_frame >= p->nb_frames)
return AVERROR_EOF;
if (avio_feof(pb))
return AVERROR_EOF;
if (p->got_audio) {
if ((ret = av_new_packet(pkt, p->audio_size)) < 0)
return ret;
memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
pkt->duration = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->stream_index = 1;
p->got_audio = 0;
return pkt->size;
}
count = (p->current_frame == 0) ? p->preload_count
: p->blocks_count_table[p->current_frame - 1];
for (i = 0; i < count; i++) {
if (p->current_frame_block >= p->frame_blks)
return AVERROR_INVALIDDATA;
offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
if (offset > p->audio_size - p->buffer_size)
return AVERROR_INVALIDDATA;
avio_read(pb, p->audio_frame + offset, p->buffer_size);
if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
p->got_audio = 1;
}
} else {
if (offset > p->video_size - p->buffer_size)
return AVERROR_INVALIDDATA;
avio_read(pb, p->video_frame + offset, p->buffer_size);
}
p->current_frame_block++;
}
if (p->frames_offset_table[p->current_frame] >= p->video_size)
return AVERROR_INVALIDDATA;
size = p->video_size - p->frames_offset_table[p->current_frame];
if ((ret = av_new_packet(pkt, size)) < 0)
return ret;
pkt->stream_index = 0;
pkt->duration = 1;
memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
if (pkt->data[0] & 0x20)
pkt->flags |= AV_PKT_FLAG_KEY;
p->current_frame++;
return pkt->size;
}
const FFInputFormat ff_paf_demuxer = {
.p.name = "paf",
.p.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
.priv_data_size = sizeof(PAFDemuxContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = read_probe,
.read_header = read_header,
.read_packet = read_packet,
.read_close = read_close,
};
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