diff options
Diffstat (limited to 'libavformat/voc_packet.c')
| -rw-r--r-- | libavformat/voc_packet.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/libavformat/voc_packet.c b/libavformat/voc_packet.c new file mode 100644 index 0000000000..f4b82312f7 --- /dev/null +++ b/libavformat/voc_packet.c @@ -0,0 +1,141 @@ +/* + * 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 "avformat.h" +#include "internal.h" +#include "voc.h" + +int +ff_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; + int64_t duration; + int ret; + + av_add_index_entry(st, + avio_tell(pb), + voc->pts, + voc->remaining_size, + 0, + AVINDEX_KEYFRAME); + + while (!voc->remaining_size) { + type = avio_r8(pb); + if (type == VOC_TYPE_EOF) + return AVERROR_EOF; + 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: + if (!dec->sample_rate) { + dec->sample_rate = 1000000 / (256 - avio_r8(pb)); + if (sample_rate) + dec->sample_rate = sample_rate; + avpriv_set_pts_info(st, 64, 1, dec->sample_rate); + dec->channels = channels; + dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id); + } else + avio_skip(pb, 1); + tmp_codec = avio_r8(pb); + 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: + if (!dec->sample_rate) { + dec->sample_rate = avio_rl32(pb); + avpriv_set_pts_info(st, 64, 1, dec->sample_rate); + dec->bits_per_coded_sample = avio_r8(pb); + dec->channels = avio_r8(pb); + } else + avio_skip(pb, 6); + 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 == AV_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 == AV_CODEC_ID_NONE) { + if (s->audio_codec_id == AV_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->channels * dec->bits_per_coded_sample; + + if (max_size <= 0) + max_size = 2048; + size = FFMIN(voc->remaining_size, max_size); + voc->remaining_size -= size; + + ret = av_get_packet(pb, pkt, size); + pkt->dts = pkt->pts = voc->pts; + + duration = av_get_audio_frame_duration(st->codec, size); + if (duration > 0 && voc->pts != AV_NOPTS_VALUE) + voc->pts += duration; + else + voc->pts = AV_NOPTS_VALUE; + + return ret; +} |