FFmpeg: libavformat/smush.c Source File

00001 /*
00002  * LucasArts Smush demuxer
00003  * Copyright (c) 2006 Cyril Zorin
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/intreadwrite.h"
00023 #include "avformat.h"
00024 #include "internal.h"
00025 #include "avio.h"
00026 
00027 typedef struct {
00028     int version;
00029     int audio_stream_index;
00030     int video_stream_index;
00031 } SMUSHContext;
00032 
00033 static int smush_read_probe(AVProbeData *p)
00034 {
00035     if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') &&
00036           AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||
00037          (AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') &&
00038           AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {
00039         return AVPROBE_SCORE_MAX;
00040     }
00041 
00042     return 0;
00043 }
00044 
00045 static int smush_read_header(AVFormatContext *ctx)
00046 {
00047     SMUSHContext *smush = ctx->priv_data;
00048     AVIOContext *pb = ctx->pb;
00049     AVStream *vst, *ast;
00050     uint32_t magic, nframes, size, subversion, i;
00051     uint32_t width = 0, height = 0, got_audio = 0, read = 0;
00052     uint32_t sample_rate, channels, palette[256];
00053 
00054     magic = avio_rb32(pb);
00055     avio_skip(pb, 4); // skip movie size
00056 
00057     if (magic == MKBETAG('A', 'N', 'I', 'M')) {
00058         if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
00059             return AVERROR_INVALIDDATA;
00060 
00061         size = avio_rb32(pb);
00062         if (size < 3 * 256 + 6)
00063             return AVERROR_INVALIDDATA;
00064 
00065         smush->version = 0;
00066         subversion     = avio_rl16(pb);
00067         nframes        = avio_rl16(pb);
00068 
00069         avio_skip(pb, 2); // skip pad
00070 
00071         for (i = 0; i < 256; i++)
00072             palette[i] = avio_rb24(pb);
00073 
00074         avio_skip(pb, size - (3 * 256 + 6));
00075     } else if (magic == MKBETAG('S', 'A', 'N', 'M') ) {
00076         if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
00077             return AVERROR_INVALIDDATA;
00078 
00079         size = avio_rb32(pb);
00080         if (size < 14)
00081             return AVERROR_INVALIDDATA;
00082 
00083         smush->version = 1;
00084         subversion     = avio_rl16(pb);
00085         nframes = avio_rl32(pb);
00086         avio_skip(pb, 2); // skip pad
00087         width  = avio_rl16(pb);
00088         height = avio_rl16(pb);
00089         avio_skip(pb, 2); // skip pad
00090         avio_skip(pb, size - 14);
00091 
00092         if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
00093             return AVERROR_INVALIDDATA;
00094 
00095         size = avio_rb32(pb);
00096         while (!got_audio && ((read + 8) < size)) {
00097             uint32_t sig, chunk_size;
00098 
00099             if (url_feof(pb))
00100                 return AVERROR_EOF;
00101 
00102             sig        = avio_rb32(pb);
00103             chunk_size = avio_rb32(pb);
00104             read += 8;
00105             switch (sig) {
00106             case MKBETAG('W', 'a', 'v', 'e'):
00107                 got_audio = 1;
00108                 sample_rate = avio_rl32(pb);
00109                 channels    = avio_rl32(pb);
00110                 avio_skip(pb, chunk_size - 8);
00111                 read += chunk_size;
00112                 break;
00113             case MKBETAG('B', 'l', '1', '6'):
00114             case MKBETAG('A', 'N', 'N', 'O'):
00115                 avio_skip(pb, chunk_size);
00116                 read += chunk_size;
00117                 break;
00118             default:
00119                 return AVERROR_INVALIDDATA;
00120                 break;
00121             }
00122         }
00123 
00124         avio_skip(pb, size - read);
00125     } else {
00126         av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
00127         return AVERROR_INVALIDDATA;
00128     }
00129 
00130     vst = avformat_new_stream(ctx, 0);
00131     if (!vst)
00132         return AVERROR(ENOMEM);
00133 
00134     smush->video_stream_index = vst->index;
00135 
00136     vst->start_time        = 0;
00137     vst->duration          =
00138     vst->nb_frames         = nframes;
00139     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00140     vst->codec->codec_id   = AV_CODEC_ID_SANM;
00141     vst->codec->codec_tag  = 0;
00142     vst->codec->width      = width;
00143     vst->codec->height     = height;
00144 
00145     avpriv_set_pts_info(vst, 64, 66667, 1000000);
00146 
00147     if (!smush->version) {
00148         vst->codec->extradata = av_malloc(1024 + 2 + FF_INPUT_BUFFER_PADDING_SIZE);
00149         if (!vst->codec->extradata)
00150             return AVERROR(ENOMEM);
00151 
00152         vst->codec->extradata_size = 1024 + 2;
00153         AV_WL16(vst->codec->extradata, subversion);
00154         for (i = 0; i < 256; i++)
00155             AV_WL32(vst->codec->extradata + 2 + i * 4, palette[i]);
00156     }
00157 
00158     if (got_audio) {
00159         ast = avformat_new_stream(ctx, 0);
00160         if (!ast)
00161             return AVERROR(ENOMEM);
00162 
00163         smush->audio_stream_index = ast->index;
00164 
00165         ast->start_time         = 0;
00166         ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
00167         ast->codec->codec_id    = AV_CODEC_ID_VIMA;
00168         ast->codec->codec_tag   = 0;
00169         ast->codec->sample_rate = sample_rate;
00170         ast->codec->channels    = channels;
00171 
00172         avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
00173     }
00174 
00175     return 0;
00176 }
00177 
00178 static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
00179 {
00180     SMUSHContext *smush = ctx->priv_data;
00181     AVIOContext *pb = ctx->pb;
00182     int done = 0;
00183 
00184     while (!done) {
00185         uint32_t sig, size;
00186 
00187         if (url_feof(pb))
00188             return AVERROR_EOF;
00189 
00190         sig    = avio_rb32(pb);
00191         size   = avio_rb32(pb);
00192 
00193         switch (sig) {
00194         case MKBETAG('F', 'R', 'M', 'E'):
00195             if (smush->version)
00196                 break;
00197             if (av_get_packet(pb, pkt, size) < 0)
00198                 return AVERROR(EIO);
00199 
00200             pkt->stream_index = smush->video_stream_index;
00201             done = 1;
00202             break;
00203         case MKBETAG('B', 'l', '1', '6'):
00204             if (av_get_packet(pb, pkt, size) < 0)
00205                 return AVERROR(EIO);
00206 
00207             pkt->stream_index = smush->video_stream_index;
00208             pkt->duration = 1;
00209             done = 1;
00210             break;
00211         case MKBETAG('W', 'a', 'v', 'e'):
00212             if (size < 13)
00213                 return AVERROR_INVALIDDATA;
00214             if (av_get_packet(pb, pkt, size) < 13)
00215                 return AVERROR(EIO);
00216 
00217             pkt->stream_index = smush->audio_stream_index;
00218             pkt->flags       |= AV_PKT_FLAG_KEY;
00219             pkt->duration = AV_RB32(pkt->data);
00220             if (pkt->duration == 0xFFFFFFFFu)
00221                 pkt->duration = AV_RB32(pkt->data + 8);
00222             done = 1;
00223             break;
00224         default:
00225             avio_skip(pb, size);
00226             break;
00227         }
00228     }
00229 
00230     return 0;
00231 }
00232 
00233 AVInputFormat ff_smush_demuxer = {
00234     .name           = "smush",
00235     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
00236     .priv_data_size = sizeof(SMUSHContext),
00237     .read_probe     = smush_read_probe,
00238     .read_header    = smush_read_header,
00239     .read_packet    = smush_read_packet,
00240 };