forked from KolibriOS/kolibrios
375 lines
12 KiB
C
375 lines
12 KiB
C
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/*
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* AIFF/AIFF-C demuxer
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* Copyright (c) 2006 Patrick Guimond
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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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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/dict.h"
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#include "avformat.h"
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#include "internal.h"
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#include "pcm.h"
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#include "aiff.h"
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#include "isom.h"
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#include "id3v2.h"
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#include "mov_chan.h"
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#define AIFF 0
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#define AIFF_C_VERSION1 0xA2805140
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typedef struct {
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int64_t data_end;
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int block_duration;
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} AIFFInputContext;
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static enum AVCodecID aiff_codec_get_id(int bps)
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{
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if (bps <= 8)
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return AV_CODEC_ID_PCM_S8;
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if (bps <= 16)
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return AV_CODEC_ID_PCM_S16BE;
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if (bps <= 24)
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return AV_CODEC_ID_PCM_S24BE;
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if (bps <= 32)
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return AV_CODEC_ID_PCM_S32BE;
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/* bigger than 32 isn't allowed */
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return AV_CODEC_ID_NONE;
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}
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/* returns the size of the found tag */
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static int get_tag(AVIOContext *pb, uint32_t * tag)
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{
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int size;
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if (url_feof(pb))
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return AVERROR(EIO);
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*tag = avio_rl32(pb);
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size = avio_rb32(pb);
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if (size < 0)
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size = 0x7fffffff;
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return size;
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}
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/* Metadata string read */
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static void get_meta(AVFormatContext *s, const char *key, int size)
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{
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uint8_t *str = av_malloc(size+1);
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if (str) {
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int res = avio_read(s->pb, str, size);
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if (res < 0){
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av_free(str);
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return;
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}
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size += (size&1)-res;
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str[res] = 0;
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av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
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}else
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size+= size&1;
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avio_skip(s->pb, size);
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}
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/* Returns the number of sound data frames or negative on error */
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static unsigned int get_aiff_header(AVFormatContext *s, int size,
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unsigned version)
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{
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AVIOContext *pb = s->pb;
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AVCodecContext *codec = s->streams[0]->codec;
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AIFFInputContext *aiff = s->priv_data;
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int exp;
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uint64_t val;
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double sample_rate;
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unsigned int num_frames;
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if (size & 1)
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size++;
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codec->codec_type = AVMEDIA_TYPE_AUDIO;
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codec->channels = avio_rb16(pb);
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num_frames = avio_rb32(pb);
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codec->bits_per_coded_sample = avio_rb16(pb);
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exp = avio_rb16(pb);
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val = avio_rb64(pb);
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sample_rate = ldexp(val, exp - 16383 - 63);
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codec->sample_rate = sample_rate;
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size -= 18;
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/* get codec id for AIFF-C */
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if (version == AIFF_C_VERSION1) {
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codec->codec_tag = avio_rl32(pb);
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codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
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size -= 4;
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}
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if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
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codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
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codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
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aiff->block_duration = 1;
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} else {
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switch (codec->codec_id) {
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case AV_CODEC_ID_PCM_F32BE:
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case AV_CODEC_ID_PCM_F64BE:
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case AV_CODEC_ID_PCM_S16LE:
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case AV_CODEC_ID_PCM_ALAW:
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case AV_CODEC_ID_PCM_MULAW:
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aiff->block_duration = 1;
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break;
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case AV_CODEC_ID_ADPCM_IMA_QT:
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codec->block_align = 34*codec->channels;
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break;
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case AV_CODEC_ID_MACE3:
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codec->block_align = 2*codec->channels;
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break;
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case AV_CODEC_ID_ADPCM_G726LE:
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codec->bits_per_coded_sample = 5;
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case AV_CODEC_ID_ADPCM_G722:
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case AV_CODEC_ID_MACE6:
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codec->block_align = 1*codec->channels;
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break;
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case AV_CODEC_ID_GSM:
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codec->block_align = 33;
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break;
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default:
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aiff->block_duration = 1;
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break;
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}
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if (codec->block_align > 0)
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aiff->block_duration = av_get_audio_frame_duration(codec,
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codec->block_align);
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}
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/* Block align needs to be computed in all cases, as the definition
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* is specific to applications -> here we use the WAVE format definition */
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if (!codec->block_align)
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codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
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if (aiff->block_duration) {
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codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
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aiff->block_duration;
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}
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/* Chunk is over */
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if (size)
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avio_skip(pb, size);
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return num_frames;
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}
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static int aiff_probe(AVProbeData *p)
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{
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/* check file header */
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if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
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p->buf[2] == 'R' && p->buf[3] == 'M' &&
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p->buf[8] == 'A' && p->buf[9] == 'I' &&
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p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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/* aiff input */
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static int aiff_read_header(AVFormatContext *s)
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{
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int ret, size, filesize;
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int64_t offset = 0, position;
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uint32_t tag;
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unsigned version = AIFF_C_VERSION1;
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AVIOContext *pb = s->pb;
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AVStream * st;
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AIFFInputContext *aiff = s->priv_data;
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ID3v2ExtraMeta *id3v2_extra_meta = NULL;
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/* check FORM header */
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filesize = get_tag(pb, &tag);
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if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
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return AVERROR_INVALIDDATA;
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/* AIFF data type */
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tag = avio_rl32(pb);
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if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
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version = AIFF;
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else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
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return AVERROR_INVALIDDATA;
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filesize -= 4;
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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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while (filesize > 0) {
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/* parse different chunks */
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size = get_tag(pb, &tag);
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if (size < 0)
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return size;
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filesize -= size + 8;
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switch (tag) {
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case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
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/* Then for the complete header info */
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st->nb_frames = get_aiff_header(s, size, version);
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if (st->nb_frames < 0)
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return st->nb_frames;
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if (offset > 0) // COMM is after SSND
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goto got_sound;
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break;
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case MKTAG('I', 'D', '3', ' '):
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position = avio_tell(pb);
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ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
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if (id3v2_extra_meta)
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if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
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ff_id3v2_free_extra_meta(&id3v2_extra_meta);
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return ret;
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}
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ff_id3v2_free_extra_meta(&id3v2_extra_meta);
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if (position + size > avio_tell(pb))
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avio_skip(pb, position + size - avio_tell(pb));
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break;
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case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
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version = avio_rb32(pb);
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break;
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case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
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get_meta(s, "title" , size);
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break;
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case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
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get_meta(s, "author" , size);
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break;
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case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
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get_meta(s, "copyright", size);
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break;
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case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
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get_meta(s, "comment" , size);
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break;
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case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
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aiff->data_end = avio_tell(pb) + size;
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offset = avio_rb32(pb); /* Offset of sound data */
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avio_rb32(pb); /* BlockSize... don't care */
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offset += avio_tell(pb); /* Compute absolute data offset */
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if (st->codec->block_align && !pb->seekable) /* Assume COMM already parsed */
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goto got_sound;
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if (!pb->seekable) {
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av_log(s, AV_LOG_ERROR, "file is not seekable\n");
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return -1;
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}
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avio_skip(pb, size - 8);
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break;
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case MKTAG('w', 'a', 'v', 'e'):
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if ((uint64_t)size > (1<<30))
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return -1;
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if (ff_alloc_extradata(st->codec, size))
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return AVERROR(ENOMEM);
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avio_read(pb, st->codec->extradata, size);
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if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
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st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
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aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
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} else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
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char rate = 0;
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if (size >= 25)
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rate = st->codec->extradata[24];
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switch (rate) {
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case 'H': // RATE_HALF
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st->codec->block_align = 17;
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break;
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case 'F': // RATE_FULL
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default:
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st->codec->block_align = 35;
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}
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aiff->block_duration = 160;
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st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
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aiff->block_duration;
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}
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break;
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case MKTAG('C','H','A','N'):
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if(ff_mov_read_chan(s, pb, st, size) < 0)
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return AVERROR_INVALIDDATA;
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break;
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default: /* Jump */
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if (size & 1) /* Always even aligned */
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size++;
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avio_skip(pb, size);
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}
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}
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got_sound:
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if (!st->codec->block_align) {
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av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
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return -1;
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}
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/* Now positioned, get the sound data start and end */
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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st->start_time = 0;
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st->duration = st->nb_frames * aiff->block_duration;
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/* Position the stream at the first block */
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avio_seek(pb, offset, SEEK_SET);
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return 0;
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}
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#define MAX_SIZE 4096
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static int aiff_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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AVStream *st = s->streams[0];
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AIFFInputContext *aiff = s->priv_data;
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int64_t max_size;
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int res, size;
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/* calculate size of remaining data */
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max_size = aiff->data_end - avio_tell(s->pb);
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if (max_size <= 0)
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return AVERROR_EOF;
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/* Now for that packet */
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if (st->codec->block_align >= 17) // GSM, QCLP, IMA4
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size = st->codec->block_align;
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else
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size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
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size = FFMIN(max_size, size);
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res = av_get_packet(s->pb, pkt, size);
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if (res < 0)
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return res;
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if (size >= st->codec->block_align)
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
|
||
|
|
/* Only one stream in an AIFF file */
|
||
|
|
pkt->stream_index = 0;
|
||
|
|
pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVInputFormat ff_aiff_demuxer = {
|
||
|
|
.name = "aiff",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
|
||
|
|
.priv_data_size = sizeof(AIFFInputContext),
|
||
|
|
.read_probe = aiff_probe,
|
||
|
|
.read_header = aiff_read_header,
|
||
|
|
.read_packet = aiff_read_packet,
|
||
|
|
.read_seek = ff_pcm_read_seek,
|
||
|
|
.codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
|
||
|
|
};
|