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