329 lines
11 KiB
C
Executable file
329 lines
11 KiB
C
Executable file
/*
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* Sierra VMD Format Demuxer
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* Copyright (c) 2004 The FFmpeg project
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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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/**
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* @file
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* Sierra VMD file demuxer
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* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
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* for more information on the Sierra VMD file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*/
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#include "libavutil/channel_layout.h"
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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_internal.h"
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#define VMD_HEADER_SIZE 0x0330
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#define BYTES_PER_FRAME_RECORD 16
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typedef struct vmd_frame {
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int stream_index;
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int64_t frame_offset;
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unsigned int frame_size;
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int64_t pts;
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int keyframe;
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unsigned char frame_record[BYTES_PER_FRAME_RECORD];
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} vmd_frame;
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typedef struct VmdDemuxContext {
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int video_stream_index;
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int audio_stream_index;
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unsigned int frame_count;
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unsigned int frames_per_block;
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vmd_frame *frame_table;
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unsigned int current_frame;
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int is_indeo3;
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int sample_rate;
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int64_t audio_sample_counter;
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int skiphdr;
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unsigned char vmd_header[VMD_HEADER_SIZE];
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} VmdDemuxContext;
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static int vmd_probe(const AVProbeData *p)
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{
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int w, h, sample_rate;
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if (p->buf_size < 806)
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return 0;
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/* check if the first 2 bytes of the file contain the appropriate size
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* of a VMD header chunk */
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if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
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return 0;
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w = AV_RL16(&p->buf[12]);
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h = AV_RL16(&p->buf[14]);
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sample_rate = AV_RL16(&p->buf[804]);
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if ((!w || w > 2048 || !h || h > 2048) &&
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sample_rate != 22050)
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return 0;
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/* only return half certainty since this check is a bit sketchy */
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return AVPROBE_SCORE_EXTENSION;
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}
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static int vmd_read_header(AVFormatContext *s)
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{
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VmdDemuxContext *vmd = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st = NULL, *vst = NULL;
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unsigned int toc_offset;
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unsigned char *raw_frame_table;
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int raw_frame_table_size;
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int64_t current_offset;
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int i, j, ret;
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int width, height;
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unsigned int total_frames;
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int64_t current_audio_pts = 0;
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unsigned char chunk[BYTES_PER_FRAME_RECORD];
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int num, den;
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int sound_buffers;
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/* fetch the main header, including the 2 header length bytes */
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avio_seek(pb, 0, SEEK_SET);
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if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
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return AVERROR(EIO);
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width = AV_RL16(&vmd->vmd_header[12]);
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height = AV_RL16(&vmd->vmd_header[14]);
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if (width && height) {
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if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
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vmd->is_indeo3 = 1;
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} else {
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vmd->is_indeo3 = 0;
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}
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/* start up the decoders */
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vst = avformat_new_stream(s, NULL);
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if (!vst)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(vst, 33, 1, 10);
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vmd->video_stream_index = vst->index;
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vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
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vst->codecpar->codec_tag = 0; /* no fourcc */
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vst->codecpar->width = width;
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vst->codecpar->height = height;
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if(vmd->is_indeo3 && vst->codecpar->width > 320){
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vst->codecpar->width >>= 1;
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vst->codecpar->height >>= 1;
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}
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if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
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return ret;
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memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
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}
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/* if sample rate is 0, assume no audio */
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vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
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if (vmd->sample_rate) {
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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vmd->audio_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_VMDAUDIO;
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st->codecpar->codec_tag = 0; /* no fourcc */
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st->codecpar->sample_rate = vmd->sample_rate;
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st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
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if (st->codecpar->block_align & 0x8000) {
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st->codecpar->bits_per_coded_sample = 16;
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st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
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} else {
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st->codecpar->bits_per_coded_sample = 8;
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}
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if (vmd->vmd_header[811] & 0x80) {
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st->codecpar->channels = 2;
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st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
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} else if (vmd->vmd_header[811] & 0x2) {
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/* Shivers 2 stereo audio */
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/* Frame length is for 1 channel */
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st->codecpar->channels = 2;
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st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
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st->codecpar->block_align = st->codecpar->block_align << 1;
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} else {
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st->codecpar->channels = 1;
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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}
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st->codecpar->bit_rate = st->codecpar->sample_rate *
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st->codecpar->bits_per_coded_sample * st->codecpar->channels;
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/* calculate pts */
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num = st->codecpar->block_align;
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den = st->codecpar->sample_rate * st->codecpar->channels;
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av_reduce(&num, &den, num, den, (1UL<<31)-1);
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if (vst)
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avpriv_set_pts_info(vst, 33, num, den);
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avpriv_set_pts_info(st, 33, num, den);
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}
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toc_offset = AV_RL32(&vmd->vmd_header[812]);
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vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
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vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
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avio_seek(pb, toc_offset, SEEK_SET);
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raw_frame_table = NULL;
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vmd->frame_table = NULL;
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sound_buffers = AV_RL16(&vmd->vmd_header[808]);
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raw_frame_table_size = vmd->frame_count * 6;
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if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
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av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
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return -1;
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}
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raw_frame_table = av_malloc(raw_frame_table_size);
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vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
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if (!raw_frame_table || !vmd->frame_table) {
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ret = AVERROR(ENOMEM);
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goto error;
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}
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if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
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raw_frame_table_size) {
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ret = AVERROR(EIO);
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goto error;
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}
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total_frames = 0;
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for (i = 0; i < vmd->frame_count; i++) {
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current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
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/* handle each entry in index block */
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for (j = 0; j < vmd->frames_per_block; j++) {
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int type;
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uint32_t size;
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if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
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av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
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if (ret >= 0)
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ret = AVERROR_INVALIDDATA;
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goto error;
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}
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type = chunk[0];
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size = AV_RL32(&chunk[2]);
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if (size > INT_MAX / 2) {
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av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
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ret = AVERROR_INVALIDDATA;
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goto error;
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}
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if(!size && type != 1)
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continue;
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switch(type) {
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case 1: /* Audio Chunk */
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if (!st) break;
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/* first audio chunk contains several audio buffers */
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vmd->frame_table[total_frames].frame_offset = current_offset;
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vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
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vmd->frame_table[total_frames].frame_size = size;
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memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
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vmd->frame_table[total_frames].pts = current_audio_pts;
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total_frames++;
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if(!current_audio_pts)
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current_audio_pts += sound_buffers - 1;
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else
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current_audio_pts++;
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break;
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case 2: /* Video Chunk */
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vmd->frame_table[total_frames].frame_offset = current_offset;
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vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
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vmd->frame_table[total_frames].frame_size = size;
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memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
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vmd->frame_table[total_frames].pts = i;
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total_frames++;
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break;
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}
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current_offset += size;
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}
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}
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av_free(raw_frame_table);
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vmd->current_frame = 0;
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vmd->frame_count = total_frames;
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return 0;
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error:
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av_freep(&raw_frame_table);
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av_freep(&vmd->frame_table);
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return ret;
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}
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static int vmd_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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VmdDemuxContext *vmd = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret = 0;
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vmd_frame *frame;
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if (vmd->current_frame >= vmd->frame_count)
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return AVERROR_EOF;
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frame = &vmd->frame_table[vmd->current_frame];
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/* position the stream (will probably be there already) */
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avio_seek(pb, frame->frame_offset, SEEK_SET);
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if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
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return AVERROR(EIO);
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ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD);
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if (ret < 0)
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return ret;
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pkt->pos= avio_tell(pb);
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memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
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if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
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ret = avio_read(pb, pkt->data, frame->frame_size);
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else
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ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
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frame->frame_size);
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if (ret != frame->frame_size) {
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ret = AVERROR(EIO);
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}
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pkt->stream_index = frame->stream_index;
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pkt->pts = frame->pts;
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av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
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(frame->frame_record[0] == 0x02) ? "video" : "audio",
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frame->frame_size + BYTES_PER_FRAME_RECORD,
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pkt->pts);
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vmd->current_frame++;
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return ret;
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}
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static int vmd_read_close(AVFormatContext *s)
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{
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VmdDemuxContext *vmd = s->priv_data;
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av_freep(&vmd->frame_table);
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return 0;
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}
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AVInputFormat ff_vmd_demuxer = {
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.name = "vmd",
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.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
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.priv_data_size = sizeof(VmdDemuxContext),
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.read_probe = vmd_probe,
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.read_header = vmd_read_header,
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.read_packet = vmd_read_packet,
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.read_close = vmd_read_close,
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};
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