350 lines
10 KiB
C
350 lines
10 KiB
C
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/*
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* AU muxer and demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* first version by Francois Revol <revol@free.fr>
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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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* Reference documents:
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* http://www.opengroup.org/public/pubs/external/auformat.html
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* http://www.goice.co.jp/member/mo/formats/au.html
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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#include "pcm.h"
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#include "libavutil/avassert.h"
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/* if we don't know the size in advance */
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#define AU_UNKNOWN_SIZE ((uint32_t)(~0))
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/* the specification requires an annotation field of at least eight bytes */
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#define AU_DEFAULT_HEADER_SIZE (24+8)
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static const AVCodecTag codec_au_tags[] = {
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{ AV_CODEC_ID_PCM_MULAW, 1 },
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{ AV_CODEC_ID_PCM_S8, 2 },
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{ AV_CODEC_ID_PCM_S16BE, 3 },
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{ AV_CODEC_ID_PCM_S24BE, 4 },
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{ AV_CODEC_ID_PCM_S32BE, 5 },
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{ AV_CODEC_ID_PCM_F32BE, 6 },
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{ AV_CODEC_ID_PCM_F64BE, 7 },
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{ AV_CODEC_ID_ADPCM_G726LE, 23 },
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{ AV_CODEC_ID_ADPCM_G722,24 },
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{ AV_CODEC_ID_ADPCM_G726LE, 25 },
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{ AV_CODEC_ID_ADPCM_G726LE, 26 },
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{ AV_CODEC_ID_PCM_ALAW, 27 },
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{ AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
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{ AV_CODEC_ID_NONE, 0 },
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};
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#if CONFIG_AU_DEMUXER
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static int au_probe(const AVProbeData *p)
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{
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if (p->buf[0] == '.' && p->buf[1] == 's' &&
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p->buf[2] == 'n' && p->buf[3] == 'd')
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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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static int au_read_annotation(AVFormatContext *s, int size)
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{
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static const char * keys[] = {
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"title",
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"artist",
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"album",
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"track",
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"genre",
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NULL };
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AVIOContext *pb = s->pb;
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enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
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char c;
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AVBPrint bprint;
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char * key = NULL;
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char * value = NULL;
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int i;
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av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
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while (size-- > 0) {
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c = avio_r8(pb);
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switch(state) {
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case PARSE_KEY:
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if (c == '\0') {
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state = PARSE_FINISHED;
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} else if (c == '=') {
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av_bprint_finalize(&bprint, &key);
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av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
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state = PARSE_VALUE;
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} else {
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av_bprint_chars(&bprint, c, 1);
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}
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break;
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case PARSE_VALUE:
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if (c == '\0' || c == '\n') {
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if (av_bprint_finalize(&bprint, &value) != 0) {
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av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
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} else {
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av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
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for (i = 0; keys[i] != NULL && key != NULL; i++) {
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if (av_strcasecmp(keys[i], key) == 0) {
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av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
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av_freep(&key);
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value = NULL;
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}
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}
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}
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av_freep(&key);
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av_freep(&value);
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state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
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} else {
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av_bprint_chars(&bprint, c, 1);
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}
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break;
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case PARSE_FINISHED:
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break;
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default:
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/* should never happen */
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av_assert0(0);
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}
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}
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av_bprint_finalize(&bprint, NULL);
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av_freep(&key);
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return 0;
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}
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#define BLOCK_SIZE 1024
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static int au_read_header(AVFormatContext *s)
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{
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int size, data_size = 0;
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unsigned int tag;
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AVIOContext *pb = s->pb;
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unsigned int id, channels, rate;
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int bps, ba = 0;
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enum AVCodecID codec;
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AVStream *st;
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tag = avio_rl32(pb);
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if (tag != MKTAG('.', 's', 'n', 'd'))
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return AVERROR_INVALIDDATA;
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size = avio_rb32(pb); /* header size */
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data_size = avio_rb32(pb); /* data size in bytes */
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if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
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av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
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return AVERROR_INVALIDDATA;
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}
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id = avio_rb32(pb);
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rate = avio_rb32(pb);
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channels = avio_rb32(pb);
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if (size > 24) {
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/* parse annotation field to get metadata */
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au_read_annotation(s, size - 24);
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}
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codec = ff_codec_get_id(codec_au_tags, id);
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if (codec == AV_CODEC_ID_NONE) {
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avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
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return AVERROR_PATCHWELCOME;
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}
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bps = av_get_bits_per_sample(codec);
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if (codec == AV_CODEC_ID_ADPCM_G726LE) {
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if (id == MKBETAG('7','2','6','2')) {
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bps = 2;
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} else {
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const uint8_t bpcss[] = {4, 0, 3, 5};
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av_assert0(id >= 23 && id < 23 + 4);
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ba = bpcss[id - 23];
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bps = bpcss[id - 23];
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}
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} else if (!bps) {
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avpriv_request_sample(s, "Unknown bits per sample");
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return AVERROR_PATCHWELCOME;
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}
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if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
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av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
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return AVERROR_INVALIDDATA;
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}
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if (rate == 0 || rate > INT_MAX) {
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av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
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return AVERROR_INVALIDDATA;
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}
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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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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_tag = id;
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st->codecpar->codec_id = codec;
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st->codecpar->channels = channels;
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st->codecpar->sample_rate = rate;
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st->codecpar->bits_per_coded_sample = bps;
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st->codecpar->bit_rate = channels * rate * bps;
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st->codecpar->block_align = ba ? ba : FFMAX(bps * st->codecpar->channels / 8, 1);
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if (data_size != AU_UNKNOWN_SIZE)
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st->duration = (((int64_t)data_size)<<3) / (st->codecpar->channels * (int64_t)bps);
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st->start_time = 0;
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avpriv_set_pts_info(st, 64, 1, rate);
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return 0;
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}
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AVInputFormat ff_au_demuxer = {
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.name = "au",
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.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
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.read_probe = au_probe,
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.read_header = au_read_header,
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.read_packet = ff_pcm_read_packet,
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.read_seek = ff_pcm_read_seek,
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.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
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};
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#endif /* CONFIG_AU_DEMUXER */
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#if CONFIG_AU_MUXER
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typedef struct AUContext {
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uint32_t header_size;
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} AUContext;
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#include "rawenc.h"
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static int au_get_annotations(AVFormatContext *s, char **buffer)
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{
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static const char * keys[] = {
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"Title",
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"Artist",
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"Album",
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"Track",
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"Genre",
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NULL };
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int i;
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int cnt = 0;
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AVDictionary *m = s->metadata;
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AVDictionaryEntry *t = NULL;
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AVBPrint bprint;
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av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
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for (i = 0; keys[i] != NULL; i++) {
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t = av_dict_get(m, keys[i], NULL, 0);
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if (t != NULL) {
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if (cnt++)
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av_bprint_chars(&bprint, '\n', 1);
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av_bprint_append_data(&bprint, keys[i], strlen(keys[i]));
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av_bprint_chars(&bprint, '=', 1);
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av_bprint_append_data(&bprint, t->value, strlen(t->value));
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}
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}
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/* pad with 0's */
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av_bprint_append_data(&bprint, "\0\0\0\0\0\0\0\0", 8);
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return av_bprint_finalize(&bprint, buffer);
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}
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static int au_write_header(AVFormatContext *s)
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{
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int ret;
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AUContext *au = s->priv_data;
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AVIOContext *pb = s->pb;
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AVCodecParameters *par = s->streams[0]->codecpar;
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char *annotations = NULL;
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au->header_size = AU_DEFAULT_HEADER_SIZE;
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if (s->nb_streams != 1) {
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av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
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return AVERROR(EINVAL);
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}
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par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
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if (!par->codec_tag) {
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av_log(s, AV_LOG_ERROR, "unsupported codec\n");
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return AVERROR(EINVAL);
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}
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if (av_dict_count(s->metadata) > 0) {
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ret = au_get_annotations(s, &annotations);
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if (ret < 0)
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return ret;
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if (annotations != NULL) {
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au->header_size = (24 + strlen(annotations) + 8) & ~7;
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if (au->header_size < AU_DEFAULT_HEADER_SIZE)
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au->header_size = AU_DEFAULT_HEADER_SIZE;
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}
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}
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ffio_wfourcc(pb, ".snd"); /* magic number */
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avio_wb32(pb, au->header_size); /* header size */
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avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
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avio_wb32(pb, par->codec_tag); /* codec ID */
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avio_wb32(pb, par->sample_rate);
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avio_wb32(pb, par->channels);
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if (annotations != NULL) {
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avio_write(pb, annotations, au->header_size - 24);
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av_freep(&annotations);
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} else {
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avio_wb64(pb, 0); /* annotation field */
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}
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return 0;
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}
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static int au_write_trailer(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AUContext *au = s->priv_data;
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int64_t file_size = avio_tell(pb);
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if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
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/* update file size */
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avio_seek(pb, 8, SEEK_SET);
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avio_wb32(pb, (uint32_t)(file_size - au->header_size));
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avio_seek(pb, file_size, SEEK_SET);
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}
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return 0;
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}
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AVOutputFormat ff_au_muxer = {
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.name = "au",
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.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
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.mime_type = "audio/basic",
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.extensions = "au",
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.priv_data_size = sizeof(AUContext),
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.audio_codec = AV_CODEC_ID_PCM_S16BE,
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.video_codec = AV_CODEC_ID_NONE,
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.write_header = au_write_header,
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.write_packet = ff_raw_write_packet,
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.write_trailer = au_write_trailer,
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.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
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.flags = AVFMT_NOTIMESTAMPS,
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};
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#endif /* CONFIG_AU_MUXER */
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