libavformat/voc_packet.c

   1 /*
   2  * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/intreadwrite.h"
  22 #include "avformat.h"
  23 #include "internal.h"
  24 #include "voc.h"
  25
  26 int
  27 ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
  28 {
  29     VocDecContext *voc = s->priv_data;
  30     AVCodecParameters *par = st->codecpar;
  31     AVIOContext *pb = s->pb;
  32     VocType type;
  33     int size, tmp_codec=-1;
  34     int sample_rate = 0;
  35     int channels = 1;
  36     int64_t duration;
  37     int ret;
  38
  39     av_add_index_entry(st,
  40                        avio_tell(pb),
  41                        voc->pts,
  42                        voc->remaining_size,
  43                        0,
  44                        AVINDEX_KEYFRAME);
  45
  46     while (!voc->remaining_size) {
  47         if (max_size < 4)
  48             max_size = 0;
  49         type = avio_r8(pb);
  50         if (type == VOC_TYPE_EOF)
  51             return AVERROR_EOF;
  52         voc->remaining_size = avio_rl24(pb);
  53         if (!voc->remaining_size) {
  54             int64_t filesize;
  55             if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
  56                 return AVERROR(EIO);
  57             filesize = avio_size(pb);
  58             if (filesize - avio_tell(pb) > INT_MAX)
  59                 return AVERROR_INVALIDDATA;
  60             voc->remaining_size = filesize - avio_tell(pb);
  61         }
  62         max_size -= 4;
  63
  64         switch (type) {
  65         case VOC_TYPE_VOICE_DATA:
  66             if (voc->remaining_size < 2) {
  67                 voc->remaining_size = 0;
  68                 return AVERROR_INVALIDDATA;
  69             }
  70             if (!par->sample_rate) {
  71                 par->sample_rate = 1000000 / (256 - avio_r8(pb));
  72                 if (sample_rate)
  73                     par->sample_rate = sample_rate;
  74                 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
  75                 par->channels = channels;
  76                 par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
  77             } else
  78                 avio_skip(pb, 1);
  79             tmp_codec = avio_r8(pb);
  80             voc->remaining_size -= 2;
  81             max_size -= 2;
  82             channels = 1;
  83             break;
  84
  85         case VOC_TYPE_VOICE_DATA_CONT:
  86             break;
  87
  88         case VOC_TYPE_EXTENDED:
  89             sample_rate = avio_rl16(pb);
  90             avio_r8(pb);
  91             channels = avio_r8(pb) + 1;
  92             sample_rate = 256000000 / (channels * (65536 - sample_rate));
  93             voc->remaining_size = 0;
  94             max_size -= 4;
  95             break;
  96
  97         case VOC_TYPE_NEW_VOICE_DATA:
  98             if (voc->remaining_size < 12) {
  99                 voc->remaining_size = 0;
 100                 return AVERROR_INVALIDDATA;
 101             }
 102             if (!par->sample_rate) {
 103                 par->sample_rate = avio_rl32(pb);
 104                 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
 105                 par->bits_per_coded_sample = avio_r8(pb);
 106                 par->channels = avio_r8(pb);
 107             } else
 108                 avio_skip(pb, 6);
 109             tmp_codec = avio_rl16(pb);
 110             avio_skip(pb, 4);
 111             voc->remaining_size -= 12;
 112             max_size -= 12;
 113             break;
 114
 115         default:
 116             avio_skip(pb, voc->remaining_size);
 117             max_size -= voc->remaining_size;
 118             voc->remaining_size = 0;
 119             break;
 120         }
 121     }
 122
 123     if (par->sample_rate <= 0) {
 124         av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", par->sample_rate);
 125         return AVERROR_INVALIDDATA;
 126     }
 127
 128     if (tmp_codec >= 0) {
 129         tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
 130         if (par->codec_id == AV_CODEC_ID_NONE)
 131             par->codec_id = tmp_codec;
 132         else if (par->codec_id != tmp_codec)
 133             av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
 134         if (par->codec_id == AV_CODEC_ID_NONE) {
 135             if (s->audio_codec_id == AV_CODEC_ID_NONE) {
 136                 av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
 137                 return AVERROR(EINVAL);
 138             }
 139             av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
 140         }
 141     }
 142
 143     par->bit_rate = (int64_t)par->sample_rate * par->channels * par->bits_per_coded_sample;
 144
 145     if (max_size <= 0)
 146         max_size = 2048;
 147     size = FFMIN(voc->remaining_size, max_size);
 148     voc->remaining_size -= size;
 149
 150     ret = av_get_packet(pb, pkt, size);
 151     pkt->dts = pkt->pts = voc->pts;
 152
 153     duration = av_get_audio_frame_duration2(st->codecpar, size);
 154     if (duration > 0 && voc->pts != AV_NOPTS_VALUE)
 155         voc->pts += duration;
 156     else
 157         voc->pts = AV_NOPTS_VALUE;
 158
 159     return ret;
 160 }