From 5855e4e0ddb21db9df543ad72583118dc95cc2bf Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Thu, 15 Oct 2009 09:46:56 +0000 Subject: Rename aiff.c to aiffdec.c Originally committed as revision 20235 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/aiffdec.c | 315 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 315 insertions(+) create mode 100644 libavformat/aiffdec.c (limited to 'libavformat/aiffdec.c') diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c new file mode 100644 index 0000000000..6cc91d4c19 --- /dev/null +++ b/libavformat/aiffdec.c @@ -0,0 +1,315 @@ +/* + * AIFF/AIFF-C demuxer + * Copyright (c) 2006 Patrick Guimond + * + * 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/intfloat_readwrite.h" +#include "avformat.h" +#include "raw.h" +#include "aiff.h" + +#define AIFF 0 +#define AIFF_C_VERSION1 0xA2805140 + +typedef struct { + int64_t data_end; +} AIFFInputContext; + +static enum CodecID aiff_codec_get_id(int bps) +{ + if (bps <= 8) + return CODEC_ID_PCM_S8; + if (bps <= 16) + return CODEC_ID_PCM_S16BE; + if (bps <= 24) + return CODEC_ID_PCM_S24BE; + if (bps <= 32) + return CODEC_ID_PCM_S32BE; + + /* bigger than 32 isn't allowed */ + return CODEC_ID_NONE; +} + +/* returns the size of the found tag */ +static int get_tag(ByteIOContext *pb, uint32_t * tag) +{ + int size; + + if (url_feof(pb)) + return AVERROR(EIO); + + *tag = get_le32(pb); + size = get_be32(pb); + + if (size < 0) + size = 0x7fffffff; + + return size; +} + +/* Metadata string read */ +static void get_meta(AVFormatContext *s, const char *key, int size) +{ + uint8_t str[1024]; + int res = get_buffer(s->pb, str, FFMIN(sizeof(str)-1, size)); + if (res < 0) + return; + + str[res] = 0; + if (size & 1) + size++; + size -= res; + if (size) + url_fskip(s->pb, size); + + av_metadata_set(&s->metadata, key, str); +} + +/* Returns the number of sound data frames or negative on error */ +static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec, + int size, unsigned version) +{ + AVExtFloat ext; + double sample_rate; + unsigned int num_frames; + + if (size & 1) + size++; + codec->codec_type = CODEC_TYPE_AUDIO; + codec->channels = get_be16(pb); + num_frames = get_be32(pb); + codec->bits_per_coded_sample = get_be16(pb); + + get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */ + sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */ + codec->sample_rate = sample_rate; + size -= 18; + + /* Got an AIFF-C? */ + if (version == AIFF_C_VERSION1) { + codec->codec_tag = get_le32(pb); + codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag); + + switch (codec->codec_id) { + case CODEC_ID_PCM_S16BE: + codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample); + codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id); + break; + case CODEC_ID_ADPCM_IMA_QT: + codec->block_align = 34*codec->channels; + codec->frame_size = 64; + break; + case CODEC_ID_MACE3: + codec->block_align = 2*codec->channels; + codec->frame_size = 6; + break; + case CODEC_ID_MACE6: + codec->block_align = 1*codec->channels; + codec->frame_size = 6; + break; + case CODEC_ID_GSM: + codec->block_align = 33; + codec->frame_size = 160; + break; + default: + break; + } + size -= 4; + } else { + /* Need the codec type */ + codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample); + codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id); + } + + /* Block align needs to be computed in all cases, as the definition + * is specific to applications -> here we use the WAVE format definition */ + if (!codec->block_align) + codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3; + + codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size : + codec->sample_rate) * (codec->block_align << 3); + + /* Chunk is over */ + if (size) + url_fseek(pb, size, SEEK_CUR); + + return num_frames; +} + +static int aiff_probe(AVProbeData *p) +{ + /* check file header */ + if (p->buf[0] == 'F' && p->buf[1] == 'O' && + p->buf[2] == 'R' && p->buf[3] == 'M' && + p->buf[8] == 'A' && p->buf[9] == 'I' && + p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C')) + return AVPROBE_SCORE_MAX; + else + return 0; +} + +/* aiff input */ +static int aiff_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + int size, filesize; + int64_t offset = 0; + uint32_t tag; + unsigned version = AIFF_C_VERSION1; + ByteIOContext *pb = s->pb; + AVStream * st; + AIFFInputContext *aiff = s->priv_data; + + /* check FORM header */ + filesize = get_tag(pb, &tag); + if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M')) + return AVERROR_INVALIDDATA; + + /* AIFF data type */ + tag = get_le32(pb); + if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */ + version = AIFF; + else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */ + return AVERROR_INVALIDDATA; + + filesize -= 4; + + st = av_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + + while (filesize > 0) { + /* parse different chunks */ + size = get_tag(pb, &tag); + if (size < 0) + return size; + + filesize -= size + 8; + + switch (tag) { + case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */ + /* Then for the complete header info */ + st->nb_frames = get_aiff_header(pb, st->codec, size, version); + if (st->nb_frames < 0) + return st->nb_frames; + if (offset > 0) // COMM is after SSND + goto got_sound; + break; + case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */ + version = get_be32(pb); + break; + case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */ + get_meta(s, "title" , size); + break; + case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */ + get_meta(s, "author" , size); + break; + case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */ + get_meta(s, "copyright", size); + break; + case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */ + get_meta(s, "comment" , size); + break; + case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */ + aiff->data_end = url_ftell(pb) + size; + offset = get_be32(pb); /* Offset of sound data */ + get_be32(pb); /* BlockSize... don't care */ + offset += url_ftell(pb); /* Compute absolute data offset */ + if (st->codec->block_align) /* Assume COMM already parsed */ + goto got_sound; + if (url_is_streamed(pb)) { + av_log(s, AV_LOG_ERROR, "file is not seekable\n"); + return -1; + } + url_fskip(pb, size - 8); + break; + case MKTAG('w', 'a', 'v', 'e'): + if ((uint64_t)size > (1<<30)) + return -1; + st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) + return AVERROR(ENOMEM); + st->codec->extradata_size = size; + get_buffer(pb, st->codec->extradata, size); + break; + default: /* Jump */ + if (size & 1) /* Always even aligned */ + size++; + url_fskip (pb, size); + } + } + + if (!st->codec->block_align) { + av_log(s, AV_LOG_ERROR, "could not find COMM tag\n"); + return -1; + } + +got_sound: + /* Now positioned, get the sound data start and end */ + if (st->nb_frames) + s->file_size = st->nb_frames * st->codec->block_align; + + av_set_pts_info(st, 64, 1, st->codec->sample_rate); + st->start_time = 0; + st->duration = st->codec->frame_size ? + st->nb_frames * st->codec->frame_size : st->nb_frames; + + /* Position the stream at the first block */ + url_fseek(pb, offset, SEEK_SET); + + return 0; +} + +#define MAX_SIZE 4096 + +static int aiff_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + AVStream *st = s->streams[0]; + AIFFInputContext *aiff = s->priv_data; + int64_t max_size; + int res; + + /* calculate size of remaining data */ + max_size = aiff->data_end - url_ftell(s->pb); + if (max_size <= 0) + return AVERROR_EOF; + + /* Now for that packet */ + max_size = FFMIN(max_size, (MAX_SIZE / st->codec->block_align) * st->codec->block_align); + res = av_get_packet(s->pb, pkt, max_size); + if (res < 0) + return res; + + /* Only one stream in an AIFF file */ + pkt->stream_index = 0; + return 0; +} + +AVInputFormat aiff_demuxer = { + "aiff", + NULL_IF_CONFIG_SMALL("Audio IFF"), + sizeof(AIFFInputContext), + aiff_probe, + aiff_read_header, + aiff_read_packet, + NULL, + pcm_read_seek, + .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0}, +}; -- cgit v1.2.3