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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 PAFDemuxContext {
  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.  
  107.     vst->codec->width  = avio_rl32(pb);
  108.     vst->codec->height = avio_rl32(pb);
  109.     avio_skip(pb, 4);
  110.  
  111.     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  112.     vst->codec->codec_tag  = 0;
  113.     vst->codec->codec_id   = AV_CODEC_ID_PAF_VIDEO;
  114.     avpriv_set_pts_info(vst, 64, 1, 10);
  115.  
  116.     ast = avformat_new_stream(s, 0);
  117.     if (!ast)
  118.         return AVERROR(ENOMEM);
  119.  
  120.     ast->start_time            = 0;
  121.     ast->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
  122.     ast->codec->codec_tag      = 0;
  123.     ast->codec->codec_id       = AV_CODEC_ID_PAF_AUDIO;
  124.     ast->codec->channels       = 2;
  125.     ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  126.     ast->codec->sample_rate    = 22050;
  127.     avpriv_set_pts_info(ast, 64, 1, 22050);
  128.  
  129.     p->buffer_size    = avio_rl32(pb);
  130.     p->preload_count  = avio_rl32(pb);
  131.     p->frame_blks     = avio_rl32(pb);
  132.     p->start_offset   = avio_rl32(pb);
  133.     p->max_video_blks = avio_rl32(pb);
  134.     p->max_audio_blks = avio_rl32(pb);
  135.     if (p->buffer_size    < 175  ||
  136.         p->max_audio_blks < 2    ||
  137.         p->max_video_blks < 1    ||
  138.         p->frame_blks     < 1    ||
  139.         p->nb_frames      < 1    ||
  140.         p->preload_count  < 1    ||
  141.         p->buffer_size    > 2048 ||
  142.         p->max_video_blks > 2048 ||
  143.         p->max_audio_blks > 2048 ||
  144.         p->nb_frames      > INT_MAX / sizeof(uint32_t) ||
  145.         p->frame_blks     > INT_MAX / sizeof(uint32_t))
  146.         return AVERROR_INVALIDDATA;
  147.  
  148.     p->blocks_count_table  = av_mallocz(p->nb_frames *
  149.                                         sizeof(*p->blocks_count_table));
  150.     p->frames_offset_table = av_mallocz(p->nb_frames *
  151.                                         sizeof(*p->frames_offset_table));
  152.     p->blocks_offset_table = av_mallocz(p->frame_blks *
  153.                                         sizeof(*p->blocks_offset_table));
  154.  
  155.     p->video_size  = p->max_video_blks * p->buffer_size;
  156.     p->video_frame = av_mallocz(p->video_size);
  157.  
  158.     p->audio_size       = p->max_audio_blks * p->buffer_size;
  159.     p->audio_frame      = av_mallocz(p->audio_size);
  160.     p->temp_audio_frame = av_mallocz(p->audio_size);
  161.  
  162.     if (!p->blocks_count_table  ||
  163.         !p->frames_offset_table ||
  164.         !p->blocks_offset_table ||
  165.         !p->video_frame         ||
  166.         !p->audio_frame         ||
  167.         !p->temp_audio_frame) {
  168.         ret = AVERROR(ENOMEM);
  169.         goto fail;
  170.     }
  171.  
  172.     avio_seek(pb, p->buffer_size, SEEK_SET);
  173.  
  174.     read_table(s, p->blocks_count_table,  p->nb_frames);
  175.     read_table(s, p->frames_offset_table, p->nb_frames);
  176.     read_table(s, p->blocks_offset_table, p->frame_blks);
  177.  
  178.     p->got_audio = 0;
  179.     p->current_frame = 0;
  180.     p->current_frame_block = 0;
  181.  
  182.     avio_seek(pb, p->start_offset, SEEK_SET);
  183.  
  184.     return 0;
  185.  
  186. fail:
  187.     read_close(s);
  188.  
  189.     return ret;
  190. }
  191.  
  192. static int read_packet(AVFormatContext *s, AVPacket *pkt)
  193. {
  194.     PAFDemuxContext *p  = s->priv_data;
  195.     AVIOContext     *pb = s->pb;
  196.     uint32_t        count, offset;
  197.     int             size, i;
  198.  
  199.     if (p->current_frame >= p->nb_frames)
  200.         return AVERROR_EOF;
  201.  
  202.     if (avio_feof(pb))
  203.         return AVERROR_EOF;
  204.  
  205.     if (p->got_audio) {
  206.         if (av_new_packet(pkt, p->audio_size) < 0)
  207.             return AVERROR(ENOMEM);
  208.  
  209.         memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
  210.         pkt->duration     = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
  211.         pkt->flags       |= AV_PKT_FLAG_KEY;
  212.         pkt->stream_index = 1;
  213.         p->got_audio      = 0;
  214.         return pkt->size;
  215.     }
  216.  
  217.     count = (p->current_frame == 0) ? p->preload_count
  218.                                     : p->blocks_count_table[p->current_frame - 1];
  219.     for (i = 0; i < count; i++) {
  220.         if (p->current_frame_block >= p->frame_blks)
  221.             return AVERROR_INVALIDDATA;
  222.  
  223.         offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
  224.         if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
  225.             if (offset > p->audio_size - p->buffer_size)
  226.                 return AVERROR_INVALIDDATA;
  227.  
  228.             avio_read(pb, p->audio_frame + offset, p->buffer_size);
  229.             if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
  230.                 memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
  231.                 p->got_audio = 1;
  232.             }
  233.         } else {
  234.             if (offset > p->video_size - p->buffer_size)
  235.                 return AVERROR_INVALIDDATA;
  236.  
  237.             avio_read(pb, p->video_frame + offset, p->buffer_size);
  238.         }
  239.         p->current_frame_block++;
  240.     }
  241.  
  242.     if (p->frames_offset_table[p->current_frame] >= p->video_size)
  243.         return AVERROR_INVALIDDATA;
  244.  
  245.     size = p->video_size - p->frames_offset_table[p->current_frame];
  246.  
  247.     if (av_new_packet(pkt, size) < 0)
  248.         return AVERROR(ENOMEM);
  249.  
  250.     pkt->stream_index = 0;
  251.     pkt->duration     = 1;
  252.     memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
  253.     if (pkt->data[0] & 0x20)
  254.         pkt->flags |= AV_PKT_FLAG_KEY;
  255.     p->current_frame++;
  256.  
  257.     return pkt->size;
  258. }
  259.  
  260. AVInputFormat ff_paf_demuxer = {
  261.     .name           = "paf",
  262.     .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
  263.     .priv_data_size = sizeof(PAFDemuxContext),
  264.     .read_probe     = read_probe,
  265.     .read_header    = read_header,
  266.     .read_packet    = read_packet,
  267.     .read_close     = read_close,
  268. };
  269.