yading@11: /*
yading@11:  * Packed Animation File demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavcodec/paf.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: #define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a"
yading@11: 
yading@11: typedef struct {
yading@11:     uint32_t buffer_size;
yading@11:     uint32_t frame_blks;
yading@11:     uint32_t nb_frames;
yading@11:     uint32_t start_offset;
yading@11:     uint32_t preload_count;
yading@11:     uint32_t max_video_blks;
yading@11:     uint32_t max_audio_blks;
yading@11: 
yading@11:     uint32_t current_frame;
yading@11:     uint32_t current_frame_count;
yading@11:     uint32_t current_frame_block;
yading@11: 
yading@11:     uint32_t *blocks_count_table;
yading@11:     uint32_t *frames_offset_table;
yading@11:     uint32_t *blocks_offset_table;
yading@11: 
yading@11:     uint8_t  *video_frame;
yading@11:     int      video_size;
yading@11: 
yading@11:     uint8_t  *audio_frame;
yading@11:     uint8_t  *temp_audio_frame;
yading@11:     int      audio_size;
yading@11: 
yading@11:     int      got_audio;
yading@11: } PAFDemuxContext;
yading@11: 
yading@11: static int read_probe(AVProbeData *p)
yading@11: {
yading@11:     if ((p->buf_size >= strlen(MAGIC)) &&
yading@11:         !memcmp(p->buf, MAGIC, strlen(MAGIC)))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_close(AVFormatContext *s)
yading@11: {
yading@11:     PAFDemuxContext *p = s->priv_data;
yading@11: 
yading@11:     av_freep(&p->blocks_count_table);
yading@11:     av_freep(&p->frames_offset_table);
yading@11:     av_freep(&p->blocks_offset_table);
yading@11:     av_freep(&p->video_frame);
yading@11:     av_freep(&p->audio_frame);
yading@11:     av_freep(&p->temp_audio_frame);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static void read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
yading@11: {
yading@11:     int i;
yading@11: 
yading@11:     for (i = 0; i < count; i++)
yading@11:         table[i] = avio_rl32(s->pb);
yading@11: 
yading@11:     avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
yading@11: }
yading@11: 
yading@11: static int read_header(AVFormatContext *s)
yading@11: {
yading@11:     PAFDemuxContext *p = s->priv_data;
yading@11:     AVIOContext     *pb = s->pb;
yading@11:     AVStream        *ast, *vst;
yading@11:     int             ret = 0;
yading@11: 
yading@11:     avio_skip(pb, 132);
yading@11: 
yading@11:     vst = avformat_new_stream(s, 0);
yading@11:     if (!vst)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     vst->start_time = 0;
yading@11:     vst->nb_frames  =
yading@11:     vst->duration   =
yading@11:     p->nb_frames = avio_rl32(pb);
yading@11:     avio_skip(pb, 4);
yading@11:     vst->codec->width  = avio_rl32(pb);
yading@11:     vst->codec->height = avio_rl32(pb);
yading@11:     avio_skip(pb, 4);
yading@11:     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     vst->codec->codec_tag  = 0;
yading@11:     vst->codec->codec_id   = AV_CODEC_ID_PAF_VIDEO;
yading@11:     avpriv_set_pts_info(vst, 64, 1, 10);
yading@11: 
yading@11:     ast = avformat_new_stream(s, 0);
yading@11:     if (!ast)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     ast->start_time         = 0;
yading@11:     ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:     ast->codec->codec_tag   = 0;
yading@11:     ast->codec->codec_id    = AV_CODEC_ID_PAF_AUDIO;
yading@11:     ast->codec->channels    = 2;
yading@11:     ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:     ast->codec->sample_rate = 22050;
yading@11:     avpriv_set_pts_info(ast, 64, 1, 22050);
yading@11: 
yading@11:     p->buffer_size    = avio_rl32(pb);
yading@11:     p->preload_count  = avio_rl32(pb);
yading@11:     p->frame_blks     = avio_rl32(pb);
yading@11:     p->start_offset   = avio_rl32(pb);
yading@11:     p->max_video_blks = avio_rl32(pb);
yading@11:     p->max_audio_blks = avio_rl32(pb);
yading@11:     if (p->buffer_size    < 175  ||
yading@11:         p->max_audio_blks < 2    ||
yading@11:         p->max_video_blks < 1    ||
yading@11:         p->frame_blks     < 1    ||
yading@11:         p->nb_frames      < 1    ||
yading@11:         p->preload_count  < 1    ||
yading@11:         p->buffer_size    > 2048 ||
yading@11:         p->max_video_blks > 2048 ||
yading@11:         p->max_audio_blks > 2048 ||
yading@11:         p->nb_frames      > INT_MAX / sizeof(uint32_t) ||
yading@11:         p->frame_blks     > INT_MAX / sizeof(uint32_t))
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     p->blocks_count_table  = av_mallocz(p->nb_frames  * sizeof(uint32_t));
yading@11:     p->frames_offset_table = av_mallocz(p->nb_frames  * sizeof(uint32_t));
yading@11:     p->blocks_offset_table = av_mallocz(p->frame_blks * sizeof(uint32_t));
yading@11: 
yading@11:     p->video_size          = p->max_video_blks * p->buffer_size;
yading@11:     p->video_frame         = av_mallocz(p->video_size);
yading@11: 
yading@11:     p->audio_size          = p->max_audio_blks * p->buffer_size;
yading@11:     p->audio_frame         = av_mallocz(p->audio_size);
yading@11:     p->temp_audio_frame    = av_mallocz(p->audio_size);
yading@11: 
yading@11:     if (!p->blocks_count_table  ||
yading@11:         !p->frames_offset_table ||
yading@11:         !p->blocks_offset_table ||
yading@11:         !p->video_frame         ||
yading@11:         !p->audio_frame         ||
yading@11:         !p->temp_audio_frame) {
yading@11:         ret = AVERROR(ENOMEM);
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     avio_seek(pb, p->buffer_size, SEEK_SET);
yading@11: 
yading@11:     read_table(s, p->blocks_count_table,  p->nb_frames);
yading@11:     read_table(s, p->frames_offset_table, p->nb_frames);
yading@11:     read_table(s, p->blocks_offset_table, p->frame_blks);
yading@11: 
yading@11:     p->got_audio = 0;
yading@11:     p->current_frame = 0;
yading@11:     p->current_frame_block = 0;
yading@11: 
yading@11:     avio_seek(pb, p->start_offset, SEEK_SET);
yading@11: 
yading@11:     return 0;
yading@11: 
yading@11: fail:
yading@11:     read_close(s);
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     PAFDemuxContext *p = s->priv_data;
yading@11:     AVIOContext     *pb = s->pb;
yading@11:     uint32_t        count, offset;
yading@11:     int             size, i;
yading@11: 
yading@11:     if (p->current_frame >= p->nb_frames)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     if (url_feof(pb))
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     if (p->got_audio) {
yading@11:         if (av_new_packet(pkt, p->audio_size) < 0)
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:         memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
yading@11:         pkt->duration     = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
yading@11:         pkt->flags       |= AV_PKT_FLAG_KEY;
yading@11:         pkt->stream_index = 1;
yading@11:         p->got_audio      = 0;
yading@11:         return pkt->size;
yading@11:     }
yading@11: 
yading@11:     count = (p->current_frame == 0) ? p->preload_count : p->blocks_count_table[p->current_frame - 1];
yading@11:     for (i = 0; i < count; i++) {
yading@11:         if (p->current_frame_block >= p->frame_blks)
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
yading@11:         if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
yading@11:             if (offset > p->audio_size - p->buffer_size)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11: 
yading@11:             avio_read(pb, p->audio_frame + offset, p->buffer_size);
yading@11:             if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
yading@11:                 memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
yading@11:                 p->got_audio = 1;
yading@11:             }
yading@11:         } else {
yading@11:             if (offset > p->video_size - p->buffer_size)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11: 
yading@11:             avio_read(pb, p->video_frame + offset, p->buffer_size);
yading@11:         }
yading@11:         p->current_frame_block++;
yading@11:     }
yading@11: 
yading@11:     size = p->video_size - p->frames_offset_table[p->current_frame];
yading@11:     if (size < 1)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     if (av_new_packet(pkt, size) < 0)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     pkt->stream_index = 0;
yading@11:     pkt->duration     = 1;
yading@11:     memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
yading@11:     if (pkt->data[0] & 0x20)
yading@11:         pkt->flags   |= AV_PKT_FLAG_KEY;
yading@11:     p->current_frame++;
yading@11: 
yading@11:     return pkt->size;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_paf_demuxer = {
yading@11:     .name           = "paf",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
yading@11:     .priv_data_size = sizeof(PAFDemuxContext),
yading@11:     .read_probe     = read_probe,
yading@11:     .read_header    = read_header,
yading@11:     .read_packet    = read_packet,
yading@11:     .read_close     = read_close,
yading@11: };