| /* |
| * Creative Voice File demuxer. |
| * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> |
| * |
| * 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 |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "voc.h" |
| #include "internal.h" |
| |
| |
| static int voc_probe(AVProbeData *p) |
| { |
| int version, check; |
| |
| if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1)) |
| return 0; |
| version = AV_RL16(p->buf + 22); |
| check = AV_RL16(p->buf + 24); |
| if (~version + 0x1234 != check) |
| return 10; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap) |
| { |
| VocDecContext *voc = s->priv_data; |
| AVIOContext *pb = s->pb; |
| int header_size; |
| AVStream *st; |
| |
| avio_skip(pb, 20); |
| header_size = avio_rl16(pb) - 22; |
| if (header_size != 4) { |
| av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size); |
| return AVERROR(ENOSYS); |
| } |
| avio_skip(pb, header_size); |
| st = av_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| |
| voc->remaining_size = 0; |
| return 0; |
| } |
| |
| int |
| voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size) |
| { |
| VocDecContext *voc = s->priv_data; |
| AVCodecContext *dec = st->codec; |
| AVIOContext *pb = s->pb; |
| VocType type; |
| int size, tmp_codec=-1; |
| int sample_rate = 0; |
| int channels = 1; |
| |
| while (!voc->remaining_size) { |
| type = avio_r8(pb); |
| if (type == VOC_TYPE_EOF) |
| return AVERROR(EIO); |
| voc->remaining_size = avio_rl24(pb); |
| if (!voc->remaining_size) { |
| if (!s->pb->seekable) |
| return AVERROR(EIO); |
| voc->remaining_size = avio_size(pb) - avio_tell(pb); |
| } |
| max_size -= 4; |
| |
| switch (type) { |
| case VOC_TYPE_VOICE_DATA: |
| dec->sample_rate = 1000000 / (256 - avio_r8(pb)); |
| if (sample_rate) |
| dec->sample_rate = sample_rate; |
| dec->channels = channels; |
| tmp_codec = avio_r8(pb); |
| dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id); |
| voc->remaining_size -= 2; |
| max_size -= 2; |
| channels = 1; |
| break; |
| |
| case VOC_TYPE_VOICE_DATA_CONT: |
| break; |
| |
| case VOC_TYPE_EXTENDED: |
| sample_rate = avio_rl16(pb); |
| avio_r8(pb); |
| channels = avio_r8(pb) + 1; |
| sample_rate = 256000000 / (channels * (65536 - sample_rate)); |
| voc->remaining_size = 0; |
| max_size -= 4; |
| break; |
| |
| case VOC_TYPE_NEW_VOICE_DATA: |
| dec->sample_rate = avio_rl32(pb); |
| dec->bits_per_coded_sample = avio_r8(pb); |
| dec->channels = avio_r8(pb); |
| tmp_codec = avio_rl16(pb); |
| avio_skip(pb, 4); |
| voc->remaining_size -= 12; |
| max_size -= 12; |
| break; |
| |
| default: |
| avio_skip(pb, voc->remaining_size); |
| max_size -= voc->remaining_size; |
| voc->remaining_size = 0; |
| break; |
| } |
| } |
| |
| if (tmp_codec >= 0) { |
| tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec); |
| if (dec->codec_id == CODEC_ID_NONE) |
| dec->codec_id = tmp_codec; |
| else if (dec->codec_id != tmp_codec) |
| av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n"); |
| if (dec->codec_id == CODEC_ID_NONE) { |
| if (s->audio_codec_id == CODEC_ID_NONE) { |
| av_log(s, AV_LOG_ERROR, "unknown codec tag\n"); |
| return AVERROR(EINVAL); |
| } |
| av_log(s, AV_LOG_WARNING, "unknown codec tag\n"); |
| } |
| } |
| |
| dec->bit_rate = dec->sample_rate * dec->bits_per_coded_sample; |
| |
| if (max_size <= 0) |
| max_size = 2048; |
| size = FFMIN(voc->remaining_size, max_size); |
| voc->remaining_size -= size; |
| return av_get_packet(pb, pkt, size); |
| } |
| |
| static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| return voc_get_packet(s, pkt, s->streams[0], 0); |
| } |
| |
| AVInputFormat ff_voc_demuxer = { |
| "voc", |
| NULL_IF_CONFIG_SMALL("Creative Voice file format"), |
| sizeof(VocDecContext), |
| voc_probe, |
| voc_read_header, |
| voc_read_packet, |
| .codec_tag=(const AVCodecTag* const []){ff_voc_codec_tags, 0}, |
| }; |