| /* |
| * 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 libavformat/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 "libavutil/intreadwrite.h" |
| #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_type; |
| |
| 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_coded_sample = 8; |
| st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample; |
| st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_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, |
| }; |