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