/* * IFF (.iff) file demuxer * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net> * * 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 iff.c * IFF file demuxer * by Jaikrishnan Menon * for more information on the .iff file format, visit: * http://wiki.multimedia.cx/index.php?title=IFF */ #include "avformat.h" #define ID_8SVX MKTAG('8','S','V','X') #define ID_VHDR MKTAG('V','H','D','R') #define ID_ATAK MKTAG('A','T','A','K') #define ID_RLSE MKTAG('R','L','S','E') #define ID_CHAN MKTAG('C','H','A','N') #define ID_FORM MKTAG('F','O','R','M') #define ID_ANNO MKTAG('A','N','N','O') #define ID_AUTH MKTAG('A','U','T','H') #define ID_CHRS MKTAG('C','H','R','S') #define ID_COPYRIGHT MKTAG('(','c',')',' ') #define ID_CSET MKTAG('C','S','E','T') #define ID_FVER MKTAG('F','V','E','R') #define ID_NAME MKTAG('N','A','M','E') #define ID_TEXT MKTAG('T','E','X','T') #define ID_BODY MKTAG('B','O','D','Y') #define LEFT 2 #define RIGHT 4 #define STEREO 6 #define PACKET_SIZE 1024 typedef enum {COMP_NONE, COMP_FIB, COMP_EXP} svx8_compression_t; typedef struct { uint32_t body_size; uint32_t sent_bytes; uint32_t audio_frame_count; } IffDemuxContext; static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size) { uint8_t *end = dest + size; size = size>>1; while(dest < end) { *dest++ = *src; *dest++ = *(src+size); src++; } } static int iff_probe(AVProbeData *p) { const uint8_t *d = p->buf; if ( AV_RL32(d) == ID_FORM && AV_RL32(d+8) == ID_8SVX) return AVPROBE_SCORE_MAX; return 0; } static int iff_read_header(AVFormatContext *s, AVFormatParameters *ap) { IffDemuxContext *iff = s->priv_data; ByteIOContext *pb = s->pb; AVStream *st; uint32_t chunk_id, data_size; int padding, done = 0; st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); st->codec->channels = 1; url_fskip(pb, 12); while(!done && !url_feof(pb)) { chunk_id = get_le32(pb); data_size = get_be32(pb); padding = data_size & 1; switch(chunk_id) { case ID_VHDR: url_fskip(pb, 12); st->codec->sample_rate = get_be16(pb); url_fskip(pb, 1); st->codec->codec_tag = get_byte(pb); url_fskip(pb, 4); break; case ID_BODY: iff->body_size = data_size; done = 1; break; case ID_CHAN: st->codec->channels = (get_be32(pb) < 6) ? 1 : 2; break; default: url_fseek(pb, data_size + padding, SEEK_CUR); break; } } if(!st->codec->sample_rate) return AVERROR_INVALIDDATA; av_set_pts_info(st, 32, 1, st->codec->sample_rate); st->codec->codec_type = CODEC_TYPE_AUDIO; switch(st->codec->codec_tag) { case COMP_NONE: st->codec->codec_id = CODEC_ID_PCM_S8; break; case COMP_FIB: st->codec->codec_id = CODEC_ID_8SVX_FIB; break; case COMP_EXP: st->codec->codec_id = CODEC_ID_8SVX_EXP; break; default: av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n"); return -1; } st->codec->bits_per_sample = 8; st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_sample; st->codec->block_align = st->codec->channels * st->codec->bits_per_sample; return 0; } static int iff_read_packet(AVFormatContext *s, AVPacket *pkt) { IffDemuxContext *iff = s->priv_data; ByteIOContext *pb = s->pb; int ret; if(iff->sent_bytes > iff->body_size) return AVERROR(EIO); if(s->streams[0]->codec->channels == 2) { uint8_t sample_buffer[PACKET_SIZE]; ret = get_buffer(pb, sample_buffer, PACKET_SIZE); if(av_new_packet(pkt, PACKET_SIZE) < 0) { av_log(s, AV_LOG_ERROR, "iff: cannot allocate packet \n"); return AVERROR(ENOMEM); } interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE); } else { ret = av_get_packet(pb, pkt, PACKET_SIZE); } if(iff->sent_bytes == 0) pkt->flags |= PKT_FLAG_KEY; iff->sent_bytes += PACKET_SIZE; pkt->stream_index = 0; pkt->pts = iff->audio_frame_count; iff->audio_frame_count += ret / s->streams[0]->codec->channels; return ret; } AVInputFormat iff_demuxer = { "IFF", NULL_IF_CONFIG_SMALL("IFF format"), sizeof(IffDemuxContext), iff_probe, iff_read_header, iff_read_packet, };