yading@11: /*
yading@11:  * LucasArts Smush demuxer
yading@11:  * Copyright (c) 2006 Cyril Zorin
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "avio.h"
yading@11: 
yading@11: typedef struct {
yading@11:     int version;
yading@11:     int audio_stream_index;
yading@11:     int video_stream_index;
yading@11: } SMUSHContext;
yading@11: 
yading@11: static int smush_read_probe(AVProbeData *p)
yading@11: {
yading@11:     if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') &&
yading@11:           AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||
yading@11:          (AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') &&
yading@11:           AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int smush_read_header(AVFormatContext *ctx)
yading@11: {
yading@11:     SMUSHContext *smush = ctx->priv_data;
yading@11:     AVIOContext *pb = ctx->pb;
yading@11:     AVStream *vst, *ast;
yading@11:     uint32_t magic, nframes, size, subversion, i;
yading@11:     uint32_t width = 0, height = 0, got_audio = 0, read = 0;
yading@11:     uint32_t sample_rate, channels, palette[256];
yading@11: 
yading@11:     magic = avio_rb32(pb);
yading@11:     avio_skip(pb, 4); // skip movie size
yading@11: 
yading@11:     if (magic == MKBETAG('A', 'N', 'I', 'M')) {
yading@11:         if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         size = avio_rb32(pb);
yading@11:         if (size < 3 * 256 + 6)
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         smush->version = 0;
yading@11:         subversion     = avio_rl16(pb);
yading@11:         nframes        = avio_rl16(pb);
yading@11: 
yading@11:         avio_skip(pb, 2); // skip pad
yading@11: 
yading@11:         for (i = 0; i < 256; i++)
yading@11:             palette[i] = avio_rb24(pb);
yading@11: 
yading@11:         avio_skip(pb, size - (3 * 256 + 6));
yading@11:     } else if (magic == MKBETAG('S', 'A', 'N', 'M') ) {
yading@11:         if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         size = avio_rb32(pb);
yading@11:         if (size < 14)
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         smush->version = 1;
yading@11:         subversion     = avio_rl16(pb);
yading@11:         nframes = avio_rl32(pb);
yading@11:         avio_skip(pb, 2); // skip pad
yading@11:         width  = avio_rl16(pb);
yading@11:         height = avio_rl16(pb);
yading@11:         avio_skip(pb, 2); // skip pad
yading@11:         avio_skip(pb, size - 14);
yading@11: 
yading@11:         if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         size = avio_rb32(pb);
yading@11:         while (!got_audio && ((read + 8) < size)) {
yading@11:             uint32_t sig, chunk_size;
yading@11: 
yading@11:             if (url_feof(pb))
yading@11:                 return AVERROR_EOF;
yading@11: 
yading@11:             sig        = avio_rb32(pb);
yading@11:             chunk_size = avio_rb32(pb);
yading@11:             read += 8;
yading@11:             switch (sig) {
yading@11:             case MKBETAG('W', 'a', 'v', 'e'):
yading@11:                 got_audio = 1;
yading@11:                 sample_rate = avio_rl32(pb);
yading@11:                 channels    = avio_rl32(pb);
yading@11:                 avio_skip(pb, chunk_size - 8);
yading@11:                 read += chunk_size;
yading@11:                 break;
yading@11:             case MKBETAG('B', 'l', '1', '6'):
yading@11:             case MKBETAG('A', 'N', 'N', 'O'):
yading@11:                 avio_skip(pb, chunk_size);
yading@11:                 read += chunk_size;
yading@11:                 break;
yading@11:             default:
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:                 break;
yading@11:             }
yading@11:         }
yading@11: 
yading@11:         avio_skip(pb, size - read);
yading@11:     } else {
yading@11:         av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     vst = avformat_new_stream(ctx, 0);
yading@11:     if (!vst)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     smush->video_stream_index = vst->index;
yading@11: 
yading@11:     vst->start_time        = 0;
yading@11:     vst->duration          =
yading@11:     vst->nb_frames         = nframes;
yading@11:     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     vst->codec->codec_id   = AV_CODEC_ID_SANM;
yading@11:     vst->codec->codec_tag  = 0;
yading@11:     vst->codec->width      = width;
yading@11:     vst->codec->height     = height;
yading@11: 
yading@11:     avpriv_set_pts_info(vst, 64, 66667, 1000000);
yading@11: 
yading@11:     if (!smush->version) {
yading@11:         vst->codec->extradata = av_malloc(1024 + 2 + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:         if (!vst->codec->extradata)
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:         vst->codec->extradata_size = 1024 + 2;
yading@11:         AV_WL16(vst->codec->extradata, subversion);
yading@11:         for (i = 0; i < 256; i++)
yading@11:             AV_WL32(vst->codec->extradata + 2 + i * 4, palette[i]);
yading@11:     }
yading@11: 
yading@11:     if (got_audio) {
yading@11:         ast = avformat_new_stream(ctx, 0);
yading@11:         if (!ast)
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:         smush->audio_stream_index = ast->index;
yading@11: 
yading@11:         ast->start_time         = 0;
yading@11:         ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:         ast->codec->codec_id    = AV_CODEC_ID_VIMA;
yading@11:         ast->codec->codec_tag   = 0;
yading@11:         ast->codec->sample_rate = sample_rate;
yading@11:         ast->codec->channels    = channels;
yading@11: 
yading@11:         avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
yading@11: {
yading@11:     SMUSHContext *smush = ctx->priv_data;
yading@11:     AVIOContext *pb = ctx->pb;
yading@11:     int done = 0;
yading@11: 
yading@11:     while (!done) {
yading@11:         uint32_t sig, size;
yading@11: 
yading@11:         if (url_feof(pb))
yading@11:             return AVERROR_EOF;
yading@11: 
yading@11:         sig    = avio_rb32(pb);
yading@11:         size   = avio_rb32(pb);
yading@11: 
yading@11:         switch (sig) {
yading@11:         case MKBETAG('F', 'R', 'M', 'E'):
yading@11:             if (smush->version)
yading@11:                 break;
yading@11:             if (av_get_packet(pb, pkt, size) < 0)
yading@11:                 return AVERROR(EIO);
yading@11: 
yading@11:             pkt->stream_index = smush->video_stream_index;
yading@11:             done = 1;
yading@11:             break;
yading@11:         case MKBETAG('B', 'l', '1', '6'):
yading@11:             if (av_get_packet(pb, pkt, size) < 0)
yading@11:                 return AVERROR(EIO);
yading@11: 
yading@11:             pkt->stream_index = smush->video_stream_index;
yading@11:             pkt->duration = 1;
yading@11:             done = 1;
yading@11:             break;
yading@11:         case MKBETAG('W', 'a', 'v', 'e'):
yading@11:             if (size < 13)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             if (av_get_packet(pb, pkt, size) < 13)
yading@11:                 return AVERROR(EIO);
yading@11: 
yading@11:             pkt->stream_index = smush->audio_stream_index;
yading@11:             pkt->flags       |= AV_PKT_FLAG_KEY;
yading@11:             pkt->duration = AV_RB32(pkt->data);
yading@11:             if (pkt->duration == 0xFFFFFFFFu)
yading@11:                 pkt->duration = AV_RB32(pkt->data + 8);
yading@11:             done = 1;
yading@11:             break;
yading@11:         default:
yading@11:             avio_skip(pb, size);
yading@11:             break;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_smush_demuxer = {
yading@11:     .name           = "smush",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
yading@11:     .priv_data_size = sizeof(SMUSHContext),
yading@11:     .read_probe     = smush_read_probe,
yading@11:     .read_header    = smush_read_header,
yading@11:     .read_packet    = smush_read_packet,
yading@11: };