/* * Westwood Studios VQA Format Demuxer * Copyright (c) 2003 The ffmpeg Project * * 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 */ /** * @file * Westwood Studios VQA file demuxer * by Mike Melanson (melanson@pcisys.net) * for more information on the Westwood file formats, visit: * http://www.pcisys.net/~melanson/codecs/ * http://www.geocities.com/SiliconValley/8682/aud3.txt */ #include "libavutil/intreadwrite.h" #include "avformat.h" #include "internal.h" #define FORM_TAG MKBETAG('F', 'O', 'R', 'M') #define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A') #define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D') #define FINF_TAG MKBETAG('F', 'I', 'N', 'F') #define SND0_TAG MKBETAG('S', 'N', 'D', '0') #define SND1_TAG MKBETAG('S', 'N', 'D', '1') #define SND2_TAG MKBETAG('S', 'N', 'D', '2') #define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R') /* don't know what these tags are for, but acknowledge their existence */ #define CINF_TAG MKBETAG('C', 'I', 'N', 'F') #define CINH_TAG MKBETAG('C', 'I', 'N', 'H') #define CIND_TAG MKBETAG('C', 'I', 'N', 'D') #define PINF_TAG MKBETAG('P', 'I', 'N', 'F') #define PINH_TAG MKBETAG('P', 'I', 'N', 'H') #define PIND_TAG MKBETAG('P', 'I', 'N', 'D') #define CMDS_TAG MKBETAG('C', 'M', 'D', 'S') #define VQA_HEADER_SIZE 0x2A #define VQA_PREAMBLE_SIZE 8 typedef struct WsVqaDemuxContext { int audio_channels; int audio_stream_index; int video_stream_index; } WsVqaDemuxContext; static int wsvqa_probe(AVProbeData *p) { /* need 12 bytes to qualify */ if (p->buf_size < 12) return 0; /* check for the VQA signatures */ if ((AV_RB32(&p->buf[0]) != FORM_TAG) || (AV_RB32(&p->buf[8]) != WVQA_TAG)) return 0; return AVPROBE_SCORE_MAX; } static int wsvqa_read_header(AVFormatContext *s, AVFormatParameters *ap) { WsVqaDemuxContext *wsvqa = s->priv_data; AVIOContext *pb = s->pb; AVStream *st; unsigned char *header; unsigned char scratch[VQA_PREAMBLE_SIZE]; unsigned int chunk_tag; unsigned int chunk_size; int fps, version, flags, sample_rate, channels; /* initialize the video decoder stream */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->start_time = 0; wsvqa->video_stream_index = st->index; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = CODEC_ID_WS_VQA; st->codec->codec_tag = 0; /* no fourcc */ /* skip to the start of the VQA header */ avio_seek(pb, 20, SEEK_SET); /* the VQA header needs to go to the decoder */ st->codec->extradata_size = VQA_HEADER_SIZE; st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); header = (unsigned char *)st->codec->extradata; if (avio_read(pb, st->codec->extradata, VQA_HEADER_SIZE) != VQA_HEADER_SIZE) { av_free(st->codec->extradata); return AVERROR(EIO); } st->codec->width = AV_RL16(&header[6]); st->codec->height = AV_RL16(&header[8]); fps = header[12]; if (fps < 1 || fps > 30) { av_log(s, AV_LOG_ERROR, "invalid fps: %d\n", fps); return AVERROR_INVALIDDATA; } avpriv_set_pts_info(st, 64, 1, fps); /* initialize the audio decoder stream for VQA v1 or nonzero samplerate */ version = AV_RL16(&header[ 0]); flags = AV_RL16(&header[ 2]); sample_rate = AV_RL16(&header[24]); channels = header[26]; if (sample_rate || (version == 1 && flags == 1)) { st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->start_time = 0; st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->extradata_size = VQA_HEADER_SIZE; st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) return AVERROR(ENOMEM); memcpy(st->codec->extradata, header, VQA_HEADER_SIZE); if (!sample_rate) sample_rate = 22050; st->codec->sample_rate = sample_rate; avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); if (!channels) channels = 1; st->codec->channels = channels; switch (version) { case 1: st->codec->codec_id = CODEC_ID_WESTWOOD_SND1; break; case 2: case 3: st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS; st->codec->bits_per_coded_sample = 4; st->codec->bit_rate = channels * sample_rate * 4; break; default: /* NOTE: version 0 is supposedly raw pcm_u8 or pcm_s16le, but we do not have any samples to validate this */ av_log_ask_for_sample(s, "VQA version %d audio\n", version); return AVERROR_PATCHWELCOME; } wsvqa->audio_stream_index = st->index; wsvqa->audio_channels = st->codec->channels; } /* there are 0 or more chunks before the FINF chunk; iterate until * FINF has been skipped and the file will be ready to be demuxed */ do { if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) return AVERROR(EIO); chunk_tag = AV_RB32(&scratch[0]); chunk_size = AV_RB32(&scratch[4]); /* catch any unknown header tags, for curiousity */ switch (chunk_tag) { case CINF_TAG: case CINH_TAG: case CIND_TAG: case PINF_TAG: case PINH_TAG: case PIND_TAG: case FINF_TAG: case CMDS_TAG: break; default: av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n", scratch[0], scratch[1], scratch[2], scratch[3]); break; } avio_skip(pb, chunk_size); } while (chunk_tag != FINF_TAG); return 0; } static int wsvqa_read_packet(AVFormatContext *s, AVPacket *pkt) { WsVqaDemuxContext *wsvqa = s->priv_data; AVIOContext *pb = s->pb; int ret = -1; unsigned char preamble[VQA_PREAMBLE_SIZE]; unsigned int chunk_type; unsigned int chunk_size; int skip_byte; while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) { chunk_type = AV_RB32(&preamble[0]); chunk_size = AV_RB32(&preamble[4]); skip_byte = chunk_size & 0x01; if ((chunk_type == SND2_TAG || chunk_type == SND1_TAG) && wsvqa->audio_channels == 0) { av_log(s, AV_LOG_ERROR, "audio chunk without any audio header information found\n"); return AVERROR_INVALIDDATA; } if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) { ret= av_get_packet(pb, pkt, chunk_size); if (ret<0) return AVERROR(EIO); if (chunk_type == SND2_TAG) { pkt->stream_index = wsvqa->audio_stream_index; /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */ pkt->duration = (chunk_size * 2) / wsvqa->audio_channels; } else if(chunk_type == SND1_TAG) { pkt->stream_index = wsvqa->audio_stream_index; /* unpacked size is stored in header */ pkt->duration = AV_RL16(pkt->data) / wsvqa->audio_channels; } else { pkt->stream_index = wsvqa->video_stream_index; pkt->duration = 1; } /* stay on 16-bit alignment */ if (skip_byte) avio_skip(pb, 1); return ret; } else { switch(chunk_type){ case CMDS_TAG: case SND0_TAG: break; default: av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type); } avio_skip(pb, chunk_size + skip_byte); } } return ret; } AVInputFormat ff_wsvqa_demuxer = { .name = "wsvqa", .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA format"), .priv_data_size = sizeof(WsVqaDemuxContext), .read_probe = wsvqa_probe, .read_header = wsvqa_read_header, .read_packet = wsvqa_read_packet, };