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  1. /*
  2.  * Packed Animation File demuxer
  3.  * Copyright (c) 2012 Paul B Mahol
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/channel_layout.h"
  23. #include "libavcodec/paf.h"
  24. #include "avformat.h"
  25. #include "internal.h"
  26.  
  27. #define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a"
  28.  
  29. typedef struct {
  30.     uint32_t buffer_size;
  31.     uint32_t frame_blks;
  32.     uint32_t nb_frames;
  33.     uint32_t start_offset;
  34.     uint32_t preload_count;
  35.     uint32_t max_video_blks;
  36.     uint32_t max_audio_blks;
  37.  
  38.     uint32_t current_frame;
  39.     uint32_t current_frame_count;
  40.     uint32_t current_frame_block;
  41.  
  42.     uint32_t *blocks_count_table;
  43.     uint32_t *frames_offset_table;
  44.     uint32_t *blocks_offset_table;
  45.  
  46.     uint8_t  *video_frame;
  47.     int      video_size;
  48.  
  49.     uint8_t  *audio_frame;
  50.     uint8_t  *temp_audio_frame;
  51.     int      audio_size;
  52.  
  53.     int      got_audio;
  54. } PAFDemuxContext;
  55.  
  56. static int read_probe(AVProbeData *p)
  57. {
  58.     if ((p->buf_size >= strlen(MAGIC)) &&
  59.         !memcmp(p->buf, MAGIC, strlen(MAGIC)))
  60.         return AVPROBE_SCORE_MAX;
  61.     return 0;
  62. }
  63.  
  64. static int read_close(AVFormatContext *s)
  65. {
  66.     PAFDemuxContext *p = s->priv_data;
  67.  
  68.     av_freep(&p->blocks_count_table);
  69.     av_freep(&p->frames_offset_table);
  70.     av_freep(&p->blocks_offset_table);
  71.     av_freep(&p->video_frame);
  72.     av_freep(&p->audio_frame);
  73.     av_freep(&p->temp_audio_frame);
  74.  
  75.     return 0;
  76. }
  77.  
  78. static void read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
  79. {
  80.     int i;
  81.  
  82.     for (i = 0; i < count; i++)
  83.         table[i] = avio_rl32(s->pb);
  84.  
  85.     avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
  86. }
  87.  
  88. static int read_header(AVFormatContext *s)
  89. {
  90.     PAFDemuxContext *p = s->priv_data;
  91.     AVIOContext     *pb = s->pb;
  92.     AVStream        *ast, *vst;
  93.     int             ret = 0;
  94.  
  95.     avio_skip(pb, 132);
  96.  
  97.     vst = avformat_new_stream(s, 0);
  98.     if (!vst)
  99.         return AVERROR(ENOMEM);
  100.  
  101.     vst->start_time = 0;
  102.     vst->nb_frames  =
  103.     vst->duration   =
  104.     p->nb_frames = avio_rl32(pb);
  105.     avio_skip(pb, 4);
  106.     vst->codec->width  = avio_rl32(pb);
  107.     vst->codec->height = avio_rl32(pb);
  108.     avio_skip(pb, 4);
  109.     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  110.     vst->codec->codec_tag  = 0;
  111.     vst->codec->codec_id   = AV_CODEC_ID_PAF_VIDEO;
  112.     avpriv_set_pts_info(vst, 64, 1, 10);
  113.  
  114.     ast = avformat_new_stream(s, 0);
  115.     if (!ast)
  116.         return AVERROR(ENOMEM);
  117.  
  118.     ast->start_time         = 0;
  119.     ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  120.     ast->codec->codec_tag   = 0;
  121.     ast->codec->codec_id    = AV_CODEC_ID_PAF_AUDIO;
  122.     ast->codec->channels    = 2;
  123.     ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  124.     ast->codec->sample_rate = 22050;
  125.     avpriv_set_pts_info(ast, 64, 1, 22050);
  126.  
  127.     p->buffer_size    = avio_rl32(pb);
  128.     p->preload_count  = avio_rl32(pb);
  129.     p->frame_blks     = avio_rl32(pb);
  130.     p->start_offset   = avio_rl32(pb);
  131.     p->max_video_blks = avio_rl32(pb);
  132.     p->max_audio_blks = avio_rl32(pb);
  133.     if (p->buffer_size    < 175  ||
  134.         p->max_audio_blks < 2    ||
  135.         p->max_video_blks < 1    ||
  136.         p->frame_blks     < 1    ||
  137.         p->nb_frames      < 1    ||
  138.         p->preload_count  < 1    ||
  139.         p->buffer_size    > 2048 ||
  140.         p->max_video_blks > 2048 ||
  141.         p->max_audio_blks > 2048 ||
  142.         p->nb_frames      > INT_MAX / sizeof(uint32_t) ||
  143.         p->frame_blks     > INT_MAX / sizeof(uint32_t))
  144.         return AVERROR_INVALIDDATA;
  145.  
  146.     p->blocks_count_table  = av_mallocz(p->nb_frames  * sizeof(uint32_t));
  147.     p->frames_offset_table = av_mallocz(p->nb_frames  * sizeof(uint32_t));
  148.     p->blocks_offset_table = av_mallocz(p->frame_blks * sizeof(uint32_t));
  149.  
  150.     p->video_size          = p->max_video_blks * p->buffer_size;
  151.     p->video_frame         = av_mallocz(p->video_size);
  152.  
  153.     p->audio_size          = p->max_audio_blks * p->buffer_size;
  154.     p->audio_frame         = av_mallocz(p->audio_size);
  155.     p->temp_audio_frame    = av_mallocz(p->audio_size);
  156.  
  157.     if (!p->blocks_count_table  ||
  158.         !p->frames_offset_table ||
  159.         !p->blocks_offset_table ||
  160.         !p->video_frame         ||
  161.         !p->audio_frame         ||
  162.         !p->temp_audio_frame) {
  163.         ret = AVERROR(ENOMEM);
  164.         goto fail;
  165.     }
  166.  
  167.     avio_seek(pb, p->buffer_size, SEEK_SET);
  168.  
  169.     read_table(s, p->blocks_count_table,  p->nb_frames);
  170.     read_table(s, p->frames_offset_table, p->nb_frames);
  171.     read_table(s, p->blocks_offset_table, p->frame_blks);
  172.  
  173.     p->got_audio = 0;
  174.     p->current_frame = 0;
  175.     p->current_frame_block = 0;
  176.  
  177.     avio_seek(pb, p->start_offset, SEEK_SET);
  178.  
  179.     return 0;
  180.  
  181. fail:
  182.     read_close(s);
  183.  
  184.     return ret;
  185. }
  186.  
  187. static int read_packet(AVFormatContext *s, AVPacket *pkt)
  188. {
  189.     PAFDemuxContext *p = s->priv_data;
  190.     AVIOContext     *pb = s->pb;
  191.     uint32_t        count, offset;
  192.     int             size, i;
  193.  
  194.     if (p->current_frame >= p->nb_frames)
  195.         return AVERROR_EOF;
  196.  
  197.     if (url_feof(pb))
  198.         return AVERROR_EOF;
  199.  
  200.     if (p->got_audio) {
  201.         if (av_new_packet(pkt, p->audio_size) < 0)
  202.             return AVERROR(ENOMEM);
  203.  
  204.         memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
  205.         pkt->duration     = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
  206.         pkt->flags       |= AV_PKT_FLAG_KEY;
  207.         pkt->stream_index = 1;
  208.         p->got_audio      = 0;
  209.         return pkt->size;
  210.     }
  211.  
  212.     count = (p->current_frame == 0) ? p->preload_count : p->blocks_count_table[p->current_frame - 1];
  213.     for (i = 0; i < count; i++) {
  214.         if (p->current_frame_block >= p->frame_blks)
  215.             return AVERROR_INVALIDDATA;
  216.  
  217.         offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
  218.         if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
  219.             if (offset > p->audio_size - p->buffer_size)
  220.                 return AVERROR_INVALIDDATA;
  221.  
  222.             avio_read(pb, p->audio_frame + offset, p->buffer_size);
  223.             if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
  224.                 memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
  225.                 p->got_audio = 1;
  226.             }
  227.         } else {
  228.             if (offset > p->video_size - p->buffer_size)
  229.                 return AVERROR_INVALIDDATA;
  230.  
  231.             avio_read(pb, p->video_frame + offset, p->buffer_size);
  232.         }
  233.         p->current_frame_block++;
  234.     }
  235.  
  236.     if (p->frames_offset_table[p->current_frame] >= p->video_size)
  237.         return AVERROR_INVALIDDATA;
  238.  
  239.     size = p->video_size - p->frames_offset_table[p->current_frame];
  240.  
  241.     if (av_new_packet(pkt, size) < 0)
  242.         return AVERROR(ENOMEM);
  243.  
  244.     pkt->stream_index = 0;
  245.     pkt->duration     = 1;
  246.     memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
  247.     if (pkt->data[0] & 0x20)
  248.         pkt->flags   |= AV_PKT_FLAG_KEY;
  249.     p->current_frame++;
  250.  
  251.     return pkt->size;
  252. }
  253.  
  254. AVInputFormat ff_paf_demuxer = {
  255.     .name           = "paf",
  256.     .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
  257.     .priv_data_size = sizeof(PAFDemuxContext),
  258.     .read_probe     = read_probe,
  259.     .read_header    = read_header,
  260.     .read_packet    = read_packet,
  261.     .read_close     = read_close,
  262. };
  263.