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ffmpeg / libavformat / caf.c @ 058aabd4

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/*
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 * CAF common code
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 * Copyright (c) 2007  Justin Ruggles
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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/**
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 * @file
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 * CAF common code
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 */
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#include "avformat.h"
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#include "internal.h"
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#include "caf.h"
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/**
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 * Known codec tags for CAF
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 */
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const AVCodecTag ff_codec_caf_tags[] = {
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    { CODEC_ID_AAC,             MKBETAG('a','a','c',' ') },
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    { CODEC_ID_AC3,             MKBETAG('a','c','-','3') },
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    { CODEC_ID_ALAC,            MKBETAG('a','l','a','c') },
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  /* FIXME: use DV demuxer, as done in MOV */
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  /*{ CODEC_ID_DVAUDIO,         MKBETAG('v','d','v','a') },*/
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  /*{ CODEC_ID_DVAUDIO,         MKBETAG('d','v','c','a') },*/
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    { CODEC_ID_ADPCM_IMA_QT,    MKBETAG('i','m','a','4') },
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    { CODEC_ID_MACE3,           MKBETAG('M','A','C','3') },
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    { CODEC_ID_MACE6,           MKBETAG('M','A','C','6') },
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    { CODEC_ID_MP3,             MKBETAG('.','m','p','3') },
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    { CODEC_ID_MP2,             MKBETAG('.','m','p','2') },
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    { CODEC_ID_MP1,             MKBETAG('.','m','p','1') },
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    { CODEC_ID_PCM_ALAW,        MKBETAG('a','l','a','w') },
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    { CODEC_ID_PCM_MULAW,       MKBETAG('u','l','a','w') },
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    { CODEC_ID_QCELP,           MKBETAG('Q','c','l','p') },
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    { CODEC_ID_QDM2,            MKBETAG('Q','D','M','2') },
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    { CODEC_ID_QDM2,            MKBETAG('Q','D','M','C') },
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  /* currently unsupported codecs */
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  /*{ AC-3 over S/PDIF          MKBETAG('c','a','c','3') },*/
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  /*{ MPEG4CELP                 MKBETAG('c','e','l','p') },*/
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  /*{ MPEG4HVXC                 MKBETAG('h','v','x','c') },*/
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  /*{ MPEG4TwinVQ               MKBETAG('t','w','v','q') },*/
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    { CODEC_ID_NONE,            0 },
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};
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typedef struct CafChannelLayout {
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    int64_t  channel_layout;
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    uint32_t layout_tag;
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} CafChannelLayout;
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static const CafChannelLayout caf_channel_layout[] = {
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    { AV_CH_LAYOUT_MONO,                         (100<<16) | 1}, //< kCAFChannelLayoutTag_Mono
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    { AV_CH_LAYOUT_STEREO,                       (101<<16) | 2}, //< kCAFChannelLayoutTag_Stereo
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    { AV_CH_LAYOUT_STEREO,                       (102<<16) | 2}, //< kCAFChannelLayoutTag_StereoHeadphones
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    { AV_CH_LAYOUT_2_1,                          (131<<16) | 3}, //< kCAFChannelLayoutTag_ITU_2_1
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    { AV_CH_LAYOUT_QUAD,                         (132<<16) | 4}, //< kCAFChannelLayoutTag_ITU_2_2
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    { AV_CH_LAYOUT_2_2,                          (132<<16) | 4}, //< kCAFChannelLayoutTag_ITU_2_2
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    { AV_CH_LAYOUT_QUAD,                         (108<<16) | 4}, //< kCAFChannelLayoutTag_Quadraphonic
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    { AV_CH_LAYOUT_SURROUND,                     (113<<16) | 3}, //< kCAFChannelLayoutTag_MPEG_3_0_A
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    { AV_CH_LAYOUT_4POINT0,                      (115<<16) | 4}, //< kCAFChannelLayoutTag_MPEG_4_0_A
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    { AV_CH_LAYOUT_5POINT0_BACK,                 (117<<16) | 5}, //< kCAFChannelLayoutTag_MPEG_5_0_A
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    { AV_CH_LAYOUT_5POINT0,                      (117<<16) | 5}, //< kCAFChannelLayoutTag_MPEG_5_0_A
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    { AV_CH_LAYOUT_5POINT1_BACK,                 (121<<16) | 6}, //< kCAFChannelLayoutTag_MPEG_5_1_A
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    { AV_CH_LAYOUT_5POINT1,                      (121<<16) | 6}, //< kCAFChannelLayoutTag_MPEG_5_1_A
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    { AV_CH_LAYOUT_7POINT1,                      (128<<16) | 8}, //< kCAFChannelLayoutTag_MPEG_7_1_C
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    { AV_CH_LAYOUT_7POINT1_WIDE,                 (126<<16) | 8}, //< kCAFChannelLayoutTag_MPEG_7_1_A
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    { AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,   (133<<16) | 3}, //< kCAFChannelLayoutTag_DVD_4
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    { AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY,      (134<<16) | 4}, //< kCAFChannelLayoutTag_DVD_5
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    { AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY,     (135<<16) | 4}, //< kCAFChannelLayoutTag_DVD_6
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    { AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY,      (135<<16) | 4}, //< kCAFChannelLayoutTag_DVD_6
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    { AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, (136<<16) | 4}, //< kCAFChannelLayoutTag_DVD_10
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    { AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,  (137<<16) | 5}, //< kCAFChannelLayoutTag_DVD_11
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    { 0, 0},
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};
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void ff_read_chan_chunk(AVFormatContext *s, int64_t size, AVCodecContext *codec)
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{
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    uint32_t layout_tag;
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    AVIOContext *pb = s->pb;
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    const CafChannelLayout *caf_layout = caf_channel_layout;
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    if (size != 12) {
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        // Channel descriptions not implemented
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        av_log_ask_for_sample(s, "Unimplemented channel layout.\n");
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        avio_skip(pb, size);
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        return;
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    }
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    layout_tag = avio_rb32(pb);
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    if (layout_tag == 0x10000) { //< kCAFChannelLayoutTag_UseChannelBitmap
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        codec->channel_layout = avio_rb32(pb);
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        avio_skip(pb, 4);
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        return;
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    }
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    while (caf_layout->channel_layout) {
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        if (layout_tag == caf_layout->layout_tag) {
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            codec->channel_layout = caf_layout->channel_layout;
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            break;
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        }
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        caf_layout++;
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    }
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    if (!codec->channel_layout)
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        av_log(s, AV_LOG_WARNING, "Unknown channel layout.\n");
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    avio_skip(pb, 8);
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}
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