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ffmpeg/libavformat/paf.c

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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 "libavcodec/paf.h"
#include "avformat.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 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);
avio_skip(pb, 4);
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, 1, 10);
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->channels = 2;
ast->codecpar->channel_layout = AV_CH_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 AVInputFormat ff_paf_demuxer = {
.name = "paf",
.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
.priv_data_size = sizeof(PAFDemuxContext),
.flags_internal = FF_FMT_INIT_CLEANUP,
.read_probe = read_probe,
.read_header = read_header,
.read_packet = read_packet,
.read_close = read_close,
};
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