271 lines
8.8 KiB
C
271 lines
8.8 KiB
C
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/*
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* Westwood Studios VQA Format Demuxer
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* Copyright (c) 2003 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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* Westwood Studios VQA file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* for more information on the Westwood file formats, visit:
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* http://www.pcisys.net/~melanson/codecs/
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* http://www.geocities.com/SiliconValley/8682/aud3.txt
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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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#define FORM_TAG MKBETAG('F', 'O', 'R', 'M')
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#define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A')
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#define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D')
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#define FINF_TAG MKBETAG('F', 'I', 'N', 'F')
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#define SND0_TAG MKBETAG('S', 'N', 'D', '0')
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#define SND1_TAG MKBETAG('S', 'N', 'D', '1')
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#define SND2_TAG MKBETAG('S', 'N', 'D', '2')
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#define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R')
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/* don't know what these tags are for, but acknowledge their existence */
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#define CINF_TAG MKBETAG('C', 'I', 'N', 'F')
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#define CINH_TAG MKBETAG('C', 'I', 'N', 'H')
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#define CIND_TAG MKBETAG('C', 'I', 'N', 'D')
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#define PINF_TAG MKBETAG('P', 'I', 'N', 'F')
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#define PINH_TAG MKBETAG('P', 'I', 'N', 'H')
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#define PIND_TAG MKBETAG('P', 'I', 'N', 'D')
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#define CMDS_TAG MKBETAG('C', 'M', 'D', 'S')
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#define VQA_HEADER_SIZE 0x2A
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#define VQA_PREAMBLE_SIZE 8
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typedef struct WsVqaDemuxContext {
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int version;
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int bps;
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int channels;
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int sample_rate;
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int audio_stream_index;
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int video_stream_index;
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} WsVqaDemuxContext;
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static int wsvqa_probe(const AVProbeData *p)
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{
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/* need 12 bytes to qualify */
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if (p->buf_size < 12)
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return 0;
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/* check for the VQA signatures */
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if ((AV_RB32(&p->buf[0]) != FORM_TAG) ||
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(AV_RB32(&p->buf[8]) != WVQA_TAG))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int wsvqa_read_header(AVFormatContext *s)
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{
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WsVqaDemuxContext *wsvqa = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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uint8_t *header;
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uint8_t scratch[VQA_PREAMBLE_SIZE];
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uint32_t chunk_tag;
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uint32_t chunk_size;
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int fps, ret;
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/* initialize the video decoder stream */
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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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st->start_time = 0;
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wsvqa->video_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_WS_VQA;
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st->codecpar->codec_tag = 0; /* no fourcc */
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/* skip to the start of the VQA header */
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avio_seek(pb, 20, SEEK_SET);
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/* the VQA header needs to go to the decoder */
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if ((ret = ff_get_extradata(s, st->codecpar, pb, VQA_HEADER_SIZE)) < 0)
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return ret;
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header = st->codecpar->extradata;
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st->codecpar->width = AV_RL16(&header[6]);
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st->codecpar->height = AV_RL16(&header[8]);
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fps = header[12];
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st->nb_frames =
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st->duration = AV_RL16(&header[4]);
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if (fps < 1 || fps > 30) {
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av_log(s, AV_LOG_ERROR, "invalid fps: %d\n", fps);
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return AVERROR_INVALIDDATA;
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}
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avpriv_set_pts_info(st, 64, 1, fps);
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wsvqa->version = AV_RL16(&header[ 0]);
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wsvqa->sample_rate = AV_RL16(&header[24]);
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wsvqa->channels = header[26];
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wsvqa->bps = header[27];
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wsvqa->audio_stream_index = -1;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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/* there are 0 or more chunks before the FINF chunk; iterate until
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* FINF has been skipped and the file will be ready to be demuxed */
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do {
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if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE)
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return AVERROR(EIO);
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chunk_tag = AV_RB32(&scratch[0]);
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chunk_size = AV_RB32(&scratch[4]);
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/* catch any unknown header tags, for curiosity */
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switch (chunk_tag) {
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case CINF_TAG:
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case CINH_TAG:
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case CIND_TAG:
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case PINF_TAG:
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case PINH_TAG:
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case PIND_TAG:
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case FINF_TAG:
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case CMDS_TAG:
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break;
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default:
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av_log(s, AV_LOG_ERROR, " note: unknown chunk seen (%s)\n",
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av_fourcc2str(chunk_tag));
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break;
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}
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avio_skip(pb, chunk_size);
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} while (chunk_tag != FINF_TAG);
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return 0;
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}
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static int wsvqa_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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WsVqaDemuxContext *wsvqa = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret = -1;
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uint8_t preamble[VQA_PREAMBLE_SIZE];
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uint32_t chunk_type;
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uint32_t chunk_size;
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int skip_byte;
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while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
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chunk_type = AV_RB32(&preamble[0]);
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chunk_size = AV_RB32(&preamble[4]);
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skip_byte = chunk_size & 0x01;
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if ((chunk_type == SND0_TAG) || (chunk_type == SND1_TAG) ||
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(chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
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ret= av_get_packet(pb, pkt, chunk_size);
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if (ret<0)
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return AVERROR(EIO);
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switch (chunk_type) {
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case SND0_TAG:
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case SND1_TAG:
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case SND2_TAG:
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if (wsvqa->audio_stream_index == -1) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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wsvqa->audio_stream_index = st->index;
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if (!wsvqa->sample_rate)
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wsvqa->sample_rate = 22050;
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if (!wsvqa->channels)
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wsvqa->channels = 1;
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if (!wsvqa->bps)
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wsvqa->bps = 8;
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st->codecpar->sample_rate = wsvqa->sample_rate;
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st->codecpar->bits_per_coded_sample = wsvqa->bps;
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st->codecpar->channels = wsvqa->channels;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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switch (chunk_type) {
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case SND0_TAG:
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if (wsvqa->bps == 16)
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
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else
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
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break;
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case SND1_TAG:
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st->codecpar->codec_id = AV_CODEC_ID_WESTWOOD_SND1;
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break;
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case SND2_TAG:
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS;
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if ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0)
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return ret;
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AV_WL16(st->codecpar->extradata, wsvqa->version);
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break;
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}
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}
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pkt->stream_index = wsvqa->audio_stream_index;
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switch (chunk_type) {
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case SND1_TAG:
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/* unpacked size is stored in header */
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if(pkt->data)
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pkt->duration = AV_RL16(pkt->data) / wsvqa->channels;
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break;
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case SND2_TAG:
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/* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
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pkt->duration = (chunk_size * 2) / wsvqa->channels;
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break;
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}
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break;
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case VQFR_TAG:
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pkt->stream_index = wsvqa->video_stream_index;
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pkt->duration = 1;
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break;
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}
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/* stay on 16-bit alignment */
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if (skip_byte)
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avio_skip(pb, 1);
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return ret;
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} else {
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switch(chunk_type){
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case CMDS_TAG:
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break;
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default:
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av_log(s, AV_LOG_INFO, "Skipping unknown chunk %s\n",
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av_fourcc2str(av_bswap32(chunk_type)));
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}
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avio_skip(pb, chunk_size + skip_byte);
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}
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}
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return ret;
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}
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AVInputFormat ff_wsvqa_demuxer = {
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.name = "wsvqa",
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.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA"),
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.priv_data_size = sizeof(WsVqaDemuxContext),
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.read_probe = wsvqa_probe,
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.read_header = wsvqa_read_header,
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.read_packet = wsvqa_read_packet,
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};
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