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