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  1. /*
  2.  * CDXL demuxer
  3.  * Copyright (c) 2011-2012 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 "libavutil/intreadwrite.h"
  24. #include "libavutil/parseutils.h"
  25. #include "libavutil/opt.h"
  26. #include "avformat.h"
  27. #include "internal.h"
  28.  
  29. #define CDXL_HEADER_SIZE 32
  30.  
  31. typedef struct CDXLDemuxContext {
  32.     AVClass     *class;
  33.     int         sample_rate;
  34.     char        *framerate;
  35.     AVRational  fps;
  36.     int         read_chunk;
  37.     uint8_t     header[CDXL_HEADER_SIZE];
  38.     int         video_stream_index;
  39.     int         audio_stream_index;
  40.     int64_t     filesize;
  41. } CDXLDemuxContext;
  42.  
  43. static int cdxl_read_probe(AVProbeData *p)
  44. {
  45.     int score = AVPROBE_SCORE_EXTENSION + 10;
  46.  
  47.     if (p->buf_size < CDXL_HEADER_SIZE)
  48.         return 0;
  49.  
  50.     /* reserved bytes should always be set to 0 */
  51.     if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10]))
  52.         return 0;
  53.  
  54.     /* check type */
  55.     if (p->buf[0] != 1)
  56.         return 0;
  57.  
  58.     /* check palette size */
  59.     if (AV_RB16(&p->buf[20]) > 512)
  60.         return 0;
  61.  
  62.     /* check number of planes */
  63.     if (p->buf[18] || !p->buf[19])
  64.         return 0;
  65.  
  66.     /* check widh and height */
  67.     if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16]))
  68.         return 0;
  69.  
  70.     /* chunk size */
  71.     if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE)
  72.         return 0;
  73.  
  74.     /* previous chunk size */
  75.     if (AV_RN32(&p->buf[6]))
  76.         score /= 2;
  77.  
  78.     /* current frame number, usually starts from 1 */
  79.     if (AV_RB16(&p->buf[12]) != 1)
  80.         score /= 2;
  81.  
  82.     return score;
  83. }
  84.  
  85. static int cdxl_read_header(AVFormatContext *s)
  86. {
  87.     CDXLDemuxContext *cdxl = s->priv_data;
  88.     int ret;
  89.  
  90.     if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) {
  91.         av_log(s, AV_LOG_ERROR,
  92.                "Could not parse framerate: %s.\n", cdxl->framerate);
  93.         return ret;
  94.     }
  95.  
  96.     cdxl->read_chunk         =  0;
  97.     cdxl->video_stream_index = -1;
  98.     cdxl->audio_stream_index = -1;
  99.  
  100.     cdxl->filesize = avio_size(s->pb);
  101.  
  102.     s->ctx_flags |= AVFMTCTX_NOHEADER;
  103.  
  104.     return 0;
  105. }
  106.  
  107. static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
  108. {
  109.     CDXLDemuxContext *cdxl = s->priv_data;
  110.     AVIOContext *pb = s->pb;
  111.     uint32_t current_size, video_size, image_size;
  112.     uint16_t audio_size, palette_size, width, height;
  113.     int64_t  pos;
  114.     int      frames, ret;
  115.  
  116.     if (avio_feof(pb))
  117.         return AVERROR_EOF;
  118.  
  119.     pos = avio_tell(pb);
  120.     if (!cdxl->read_chunk &&
  121.         avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
  122.         return AVERROR_EOF;
  123.     if (cdxl->header[0] != 1) {
  124.         av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n");
  125.         return AVERROR_INVALIDDATA;
  126.     }
  127.  
  128.     current_size = AV_RB32(&cdxl->header[2]);
  129.     width        = AV_RB16(&cdxl->header[14]);
  130.     height       = AV_RB16(&cdxl->header[16]);
  131.     palette_size = AV_RB16(&cdxl->header[20]);
  132.     audio_size   = AV_RB16(&cdxl->header[22]);
  133.     if (FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
  134.         return AVERROR_INVALIDDATA;
  135.     image_size   = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
  136.     video_size   = palette_size + image_size;
  137.  
  138.     if (palette_size > 512)
  139.         return AVERROR_INVALIDDATA;
  140.     if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
  141.         return AVERROR_INVALIDDATA;
  142.  
  143.     if (cdxl->read_chunk && audio_size) {
  144.         if (cdxl->audio_stream_index == -1) {
  145.             AVStream *st = avformat_new_stream(s, NULL);
  146.             if (!st)
  147.                 return AVERROR(ENOMEM);
  148.  
  149.             st->codec->codec_type    = AVMEDIA_TYPE_AUDIO;
  150.             st->codec->codec_tag     = 0;
  151.             st->codec->codec_id      = AV_CODEC_ID_PCM_S8;
  152.             if (cdxl->header[1] & 0x10) {
  153.                 st->codec->channels       = 2;
  154.                 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  155.             } else {
  156.                 st->codec->channels       = 1;
  157.                 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  158.             }
  159.             st->codec->sample_rate   = cdxl->sample_rate;
  160.             st->start_time           = 0;
  161.             cdxl->audio_stream_index = st->index;
  162.             avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
  163.         }
  164.  
  165.         ret = av_get_packet(pb, pkt, audio_size);
  166.         if (ret < 0)
  167.             return ret;
  168.         pkt->stream_index = cdxl->audio_stream_index;
  169.         pkt->pos          = pos;
  170.         pkt->duration     = audio_size;
  171.         cdxl->read_chunk  = 0;
  172.     } else {
  173.         if (cdxl->video_stream_index == -1) {
  174.             AVStream *st = avformat_new_stream(s, NULL);
  175.             if (!st)
  176.                 return AVERROR(ENOMEM);
  177.  
  178.             st->codec->codec_type    = AVMEDIA_TYPE_VIDEO;
  179.             st->codec->codec_tag     = 0;
  180.             st->codec->codec_id      = AV_CODEC_ID_CDXL;
  181.             st->codec->width         = width;
  182.             st->codec->height        = height;
  183.  
  184.             if (audio_size + video_size && cdxl->filesize > 0) {
  185.                 frames = cdxl->filesize / (audio_size + video_size);
  186.  
  187.                 if(cdxl->framerate)
  188.                     st->duration = frames;
  189.                 else
  190.                     st->duration = frames * (int64_t)audio_size;
  191.             }
  192.             st->start_time           = 0;
  193.             cdxl->video_stream_index = st->index;
  194.             if (cdxl->framerate)
  195.                 avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num);
  196.             else
  197.                 avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
  198.         }
  199.  
  200.         if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0)
  201.             return AVERROR(ENOMEM);
  202.         memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
  203.         ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
  204.         if (ret < 0) {
  205.             av_free_packet(pkt);
  206.             return ret;
  207.         }
  208.         av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret);
  209.         pkt->stream_index  = cdxl->video_stream_index;
  210.         pkt->flags        |= AV_PKT_FLAG_KEY;
  211.         pkt->pos           = pos;
  212.         pkt->duration      = cdxl->framerate ? 1 : audio_size ? audio_size : 220;
  213.         cdxl->read_chunk   = audio_size;
  214.     }
  215.  
  216.     if (!cdxl->read_chunk)
  217.         avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
  218.     return ret;
  219. }
  220.  
  221. #define OFFSET(x) offsetof(CDXLDemuxContext, x)
  222. static const AVOption cdxl_options[] = {
  223.     { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT,    { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  224.     { "framerate",   "", OFFSET(framerate),   AV_OPT_TYPE_STRING, { .str = NULL },  0, 0,       AV_OPT_FLAG_DECODING_PARAM },
  225.     { NULL },
  226. };
  227.  
  228. static const AVClass cdxl_demuxer_class = {
  229.     .class_name = "CDXL demuxer",
  230.     .item_name  = av_default_item_name,
  231.     .option     = cdxl_options,
  232.     .version    = LIBAVUTIL_VERSION_INT,
  233. };
  234.  
  235. AVInputFormat ff_cdxl_demuxer = {
  236.     .name           = "cdxl",
  237.     .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
  238.     .priv_data_size = sizeof(CDXLDemuxContext),
  239.     .read_probe     = cdxl_read_probe,
  240.     .read_header    = cdxl_read_header,
  241.     .read_packet    = cdxl_read_packet,
  242.     .extensions     = "cdxl,xl",
  243.     .flags          = AVFMT_GENERIC_INDEX,
  244.     .priv_class     = &cdxl_demuxer_class,
  245. };
  246.