| /* |
| * LucasArts Smush demuxer |
| * Copyright (c) 2006 Cyril Zorin |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| |
| #include "avformat.h" |
| #include "avio.h" |
| #include "internal.h" |
| |
| typedef struct SMUSHContext { |
| int version; |
| int audio_stream_index; |
| int video_stream_index; |
| } SMUSHContext; |
| |
| static int smush_read_probe(AVProbeData *p) |
| { |
| if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') && |
| AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) || |
| (AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') && |
| AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) { |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| return 0; |
| } |
| |
| static int smush_read_header(AVFormatContext *ctx) |
| { |
| SMUSHContext *smush = ctx->priv_data; |
| AVIOContext *pb = ctx->pb; |
| AVStream *vst, *ast; |
| uint32_t magic, nframes, size, subversion, i; |
| uint32_t width = 0, height = 0, got_audio = 0, read = 0; |
| uint32_t sample_rate, channels, palette[256]; |
| |
| magic = avio_rb32(pb); |
| avio_skip(pb, 4); // skip movie size |
| |
| if (magic == MKBETAG('A', 'N', 'I', 'M')) { |
| if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R')) |
| return AVERROR_INVALIDDATA; |
| |
| size = avio_rb32(pb); |
| if (size < 3 * 256 + 6) |
| return AVERROR_INVALIDDATA; |
| |
| smush->version = 0; |
| subversion = avio_rl16(pb); |
| nframes = avio_rl16(pb); |
| if (!nframes) |
| return AVERROR_INVALIDDATA; |
| |
| avio_skip(pb, 2); // skip pad |
| |
| for (i = 0; i < 256; i++) |
| palette[i] = avio_rb24(pb); |
| |
| avio_skip(pb, size - (3 * 256 + 6)); |
| } else if (magic == MKBETAG('S', 'A', 'N', 'M')) { |
| if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R')) |
| return AVERROR_INVALIDDATA; |
| |
| size = avio_rb32(pb); |
| if (size < 14) |
| return AVERROR_INVALIDDATA; |
| |
| smush->version = 1; |
| subversion = avio_rl16(pb); |
| nframes = avio_rl32(pb); |
| if (!nframes) |
| return AVERROR_INVALIDDATA; |
| |
| avio_skip(pb, 2); // skip pad |
| width = avio_rl16(pb); |
| height = avio_rl16(pb); |
| avio_skip(pb, 2); // skip pad |
| avio_skip(pb, size - 14); |
| |
| if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D')) |
| return AVERROR_INVALIDDATA; |
| |
| size = avio_rb32(pb); |
| while (!got_audio && ((read + 8) < size)) { |
| uint32_t sig, chunk_size; |
| |
| if (avio_feof(pb)) |
| return AVERROR_EOF; |
| |
| sig = avio_rb32(pb); |
| chunk_size = avio_rb32(pb); |
| read += 8; |
| switch (sig) { |
| case MKBETAG('W', 'a', 'v', 'e'): |
| got_audio = 1; |
| sample_rate = avio_rl32(pb); |
| if (!sample_rate) |
| return AVERROR_INVALIDDATA; |
| |
| channels = avio_rl32(pb); |
| if (!channels) |
| return AVERROR_INVALIDDATA; |
| |
| avio_skip(pb, chunk_size - 8); |
| read += chunk_size; |
| break; |
| case MKBETAG('B', 'l', '1', '6'): |
| case MKBETAG('A', 'N', 'N', 'O'): |
| avio_skip(pb, chunk_size); |
| read += chunk_size; |
| break; |
| default: |
| return AVERROR_INVALIDDATA; |
| break; |
| } |
| } |
| |
| avio_skip(pb, size - read); |
| } else { |
| av_log(ctx, AV_LOG_ERROR, "Wrong magic\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| vst = avformat_new_stream(ctx, 0); |
| if (!vst) |
| return AVERROR(ENOMEM); |
| |
| smush->video_stream_index = vst->index; |
| |
| avpriv_set_pts_info(vst, 64, 1, 15); |
| |
| vst->start_time = 0; |
| vst->duration = |
| vst->nb_frames = nframes; |
| vst->avg_frame_rate = av_inv_q(vst->time_base); |
| vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| vst->codec->codec_id = AV_CODEC_ID_SANM; |
| vst->codec->codec_tag = 0; |
| vst->codec->width = width; |
| vst->codec->height = height; |
| |
| if (!smush->version) { |
| if (ff_alloc_extradata(vst->codec, 1024 + 2)) |
| return AVERROR(ENOMEM); |
| |
| AV_WL16(vst->codec->extradata, subversion); |
| for (i = 0; i < 256; i++) |
| AV_WL32(vst->codec->extradata + 2 + i * 4, palette[i]); |
| } |
| |
| if (got_audio) { |
| ast = avformat_new_stream(ctx, 0); |
| if (!ast) |
| return AVERROR(ENOMEM); |
| |
| smush->audio_stream_index = ast->index; |
| |
| ast->start_time = 0; |
| ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| ast->codec->codec_id = AV_CODEC_ID_ADPCM_VIMA; |
| ast->codec->codec_tag = 0; |
| ast->codec->sample_rate = sample_rate; |
| ast->codec->channels = channels; |
| |
| avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
| } |
| |
| return 0; |
| } |
| |
| static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt) |
| { |
| SMUSHContext *smush = ctx->priv_data; |
| AVIOContext *pb = ctx->pb; |
| int done = 0; |
| int ret; |
| |
| while (!done) { |
| uint32_t sig, size; |
| |
| if (avio_feof(pb)) |
| return AVERROR_EOF; |
| |
| sig = avio_rb32(pb); |
| size = avio_rb32(pb); |
| |
| switch (sig) { |
| case MKBETAG('F', 'R', 'M', 'E'): |
| if (smush->version) |
| break; |
| if ((ret = av_get_packet(pb, pkt, size)) < 0) |
| return ret; |
| |
| pkt->stream_index = smush->video_stream_index; |
| done = 1; |
| break; |
| case MKBETAG('B', 'l', '1', '6'): |
| if ((ret = av_get_packet(pb, pkt, size)) < 0) |
| return ret; |
| |
| pkt->stream_index = smush->video_stream_index; |
| pkt->duration = 1; |
| done = 1; |
| break; |
| case MKBETAG('W', 'a', 'v', 'e'): |
| if (size < 13) |
| return AVERROR_INVALIDDATA; |
| if (av_get_packet(pb, pkt, size) < 13) |
| return AVERROR(EIO); |
| |
| pkt->stream_index = smush->audio_stream_index; |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| pkt->duration = AV_RB32(pkt->data); |
| if (pkt->duration == 0xFFFFFFFFu) |
| pkt->duration = AV_RB32(pkt->data + 8); |
| done = 1; |
| break; |
| default: |
| avio_skip(pb, size); |
| break; |
| } |
| } |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_smush_demuxer = { |
| .name = "smush", |
| .long_name = NULL_IF_CONFIG_SMALL("LucasArts Smush"), |
| .priv_data_size = sizeof(SMUSHContext), |
| .read_probe = smush_read_probe, |
| .read_header = smush_read_header, |
| .read_packet = smush_read_packet, |
| }; |