240 lines
7.3 KiB
C
240 lines
7.3 KiB
C
/*
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* DXA demuxer
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* Copyright (c) 2007 Konstantin Shishkov
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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 <inttypes.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 "riff.h"
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#define DXA_EXTRA_SIZE 9
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typedef struct DXAContext {
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int frames;
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int has_sound;
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int bpc;
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uint32_t bytes_left;
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int64_t wavpos, vidpos;
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int readvid;
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}DXAContext;
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static int dxa_probe(const AVProbeData *p)
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{
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int w, h;
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if (p->buf_size < 15)
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return 0;
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w = AV_RB16(p->buf + 11);
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h = AV_RB16(p->buf + 13);
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/* check file header */
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if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
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p->buf[2] == 'X' && p->buf[3] == 'A' &&
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w && w <= 2048 && h && h <= 2048)
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int dxa_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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DXAContext *c = s->priv_data;
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AVStream *st, *ast;
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uint32_t tag;
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int32_t fps;
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int w, h;
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int num, den;
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int flags;
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int ret;
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tag = avio_rl32(pb);
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if (tag != MKTAG('D', 'E', 'X', 'A'))
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return AVERROR_INVALIDDATA;
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flags = avio_r8(pb);
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c->frames = avio_rb16(pb);
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if(!c->frames){
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av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
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return AVERROR_INVALIDDATA;
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}
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fps = avio_rb32(pb);
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if(fps > 0){
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den = 1000;
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num = fps;
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}else if (fps < 0 && fps > INT_MIN){
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den = 100000;
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num = -fps;
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}else{
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den = 10;
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num = 1;
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}
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w = avio_rb16(pb);
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h = avio_rb16(pb);
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c->has_sound = 0;
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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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// Parse WAV data header
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if(avio_rl32(pb) == MKTAG('W', 'A', 'V', 'E')){
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uint32_t size, fsize;
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c->has_sound = 1;
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size = avio_rb32(pb);
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c->vidpos = avio_tell(pb) + size;
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avio_skip(pb, 16);
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fsize = avio_rl32(pb);
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ast = avformat_new_stream(s, NULL);
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if (!ast)
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return AVERROR(ENOMEM);
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ret = ff_get_wav_header(s, pb, ast->codecpar, fsize, 0);
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if (ret < 0)
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return ret;
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if (ast->codecpar->sample_rate > 0)
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avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
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// find 'data' chunk
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while(avio_tell(pb) < c->vidpos && !avio_feof(pb)){
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tag = avio_rl32(pb);
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fsize = avio_rl32(pb);
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if(tag == MKTAG('d', 'a', 't', 'a')) break;
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avio_skip(pb, fsize);
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}
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c->bpc = (fsize + (int64_t)c->frames - 1) / c->frames;
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if(ast->codecpar->block_align) {
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if (c->bpc > INT_MAX - ast->codecpar->block_align + 1)
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return AVERROR_INVALIDDATA;
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c->bpc = ((c->bpc + ast->codecpar->block_align - 1) / ast->codecpar->block_align) * ast->codecpar->block_align;
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}
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c->bytes_left = fsize;
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c->wavpos = avio_tell(pb);
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avio_seek(pb, c->vidpos, SEEK_SET);
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}
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/* now we are ready: build format streams */
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_DXA;
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st->codecpar->width = w;
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st->codecpar->height = h;
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av_reduce(&den, &num, den, num, (1UL<<31)-1);
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avpriv_set_pts_info(st, 33, num, den);
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/* flags & 0x80 means that image is interlaced,
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* flags & 0x40 means that image has double height
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* either way set true height
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*/
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if(flags & 0xC0){
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st->codecpar->height >>= 1;
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}
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c->readvid = !c->has_sound;
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c->vidpos = avio_tell(pb);
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s->start_time = 0;
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s->duration = av_rescale(c->frames, AV_TIME_BASE * (int64_t)num, den);
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av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
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return 0;
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}
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static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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DXAContext *c = s->priv_data;
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int ret;
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uint32_t size;
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uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
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int pal_size = 0;
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if(!c->readvid && c->has_sound && c->bytes_left){
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c->readvid = 1;
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avio_seek(s->pb, c->wavpos, SEEK_SET);
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size = FFMIN(c->bytes_left, c->bpc);
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ret = av_get_packet(s->pb, pkt, size);
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pkt->stream_index = 1;
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if(ret != size)
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return AVERROR(EIO);
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c->bytes_left -= size;
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c->wavpos = avio_tell(s->pb);
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return 0;
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}
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avio_seek(s->pb, c->vidpos, SEEK_SET);
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while(!avio_feof(s->pb) && c->frames){
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uint32_t tag;
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if ((ret = avio_read(s->pb, buf, 4)) != 4) {
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av_log(s, AV_LOG_ERROR, "failed reading chunk type\n");
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return ret < 0 ? ret : AVERROR_INVALIDDATA;
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}
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tag = AV_RL32(buf);
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switch (tag) {
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case MKTAG('N', 'U', 'L', 'L'):
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if ((ret = av_new_packet(pkt, 4 + pal_size)) < 0)
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return ret;
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pkt->stream_index = 0;
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if(pal_size) memcpy(pkt->data, pal, pal_size);
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memcpy(pkt->data + pal_size, buf, 4);
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c->frames--;
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c->vidpos = avio_tell(s->pb);
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c->readvid = 0;
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return 0;
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case MKTAG('C', 'M', 'A', 'P'):
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pal_size = 768+4;
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memcpy(pal, buf, 4);
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avio_read(s->pb, pal + 4, 768);
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break;
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case MKTAG('F', 'R', 'A', 'M'):
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if ((ret = avio_read(s->pb, buf + 4, DXA_EXTRA_SIZE - 4)) != DXA_EXTRA_SIZE - 4) {
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av_log(s, AV_LOG_ERROR, "failed reading dxa_extra\n");
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return ret < 0 ? ret : AVERROR_INVALIDDATA;
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}
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size = AV_RB32(buf + 5);
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if(size > 0xFFFFFF){
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av_log(s, AV_LOG_ERROR, "Frame size is too big: %"PRIu32"\n",
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size);
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return AVERROR_INVALIDDATA;
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}
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ret = av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size);
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if (ret < 0)
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return ret;
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memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
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ret = avio_read(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
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if(ret != size){
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return AVERROR(EIO);
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}
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if(pal_size) memcpy(pkt->data, pal, pal_size);
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pkt->stream_index = 0;
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c->frames--;
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c->vidpos = avio_tell(s->pb);
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c->readvid = 0;
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return 0;
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default:
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av_log(s, AV_LOG_ERROR, "Unknown tag %s\n", av_fourcc2str(tag));
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return AVERROR_INVALIDDATA;
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}
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}
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return AVERROR_EOF;
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}
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AVInputFormat ff_dxa_demuxer = {
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.name = "dxa",
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.long_name = NULL_IF_CONFIG_SMALL("DXA"),
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.priv_data_size = sizeof(DXAContext),
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.read_probe = dxa_probe,
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.read_header = dxa_read_header,
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.read_packet = dxa_read_packet,
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};
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