mirror of https://git.ffmpeg.org/ffmpeg.git
428 lines
14 KiB
C
428 lines
14 KiB
C
/*
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* Core Audio Format demuxer
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* Copyright (c) 2007 Justin Ruggles
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* Copyright (c) 2009 Peter Ross
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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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* Core Audio Format demuxer
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "riff.h"
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#include "isom.h"
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#include "mov_chan.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat.h"
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#include "libavutil/dict.h"
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#include "caf.h"
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typedef struct {
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int bytes_per_packet; ///< bytes in a packet, or 0 if variable
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int frames_per_packet; ///< frames in a packet, or 0 if variable
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int64_t num_bytes; ///< total number of bytes in stream
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int64_t packet_cnt; ///< packet counter
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int64_t frame_cnt; ///< frame counter
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int64_t data_start; ///< data start position, in bytes
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int64_t data_size; ///< raw data size, in bytes
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} CaffContext;
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static int probe(AVProbeData *p)
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{
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if (AV_RB32(p->buf) == MKBETAG('c','a','f','f') && AV_RB16(&p->buf[4]) == 1)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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/** Read audio description chunk */
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static int read_desc_chunk(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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CaffContext *caf = s->priv_data;
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AVStream *st;
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int flags;
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/* new audio stream */
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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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/* parse format description */
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->sample_rate = av_int2double(avio_rb64(pb));
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st->codec->codec_tag = avio_rl32(pb);
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flags = avio_rb32(pb);
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caf->bytes_per_packet = avio_rb32(pb);
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st->codec->block_align = caf->bytes_per_packet;
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caf->frames_per_packet = avio_rb32(pb);
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st->codec->channels = avio_rb32(pb);
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st->codec->bits_per_coded_sample = avio_rb32(pb);
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/* calculate bit rate for constant size packets */
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if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
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st->codec->bit_rate = (uint64_t)st->codec->sample_rate * (uint64_t)caf->bytes_per_packet * 8
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/ (uint64_t)caf->frames_per_packet;
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} else {
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st->codec->bit_rate = 0;
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}
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/* determine codec */
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if (st->codec->codec_tag == MKTAG('l','p','c','m'))
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st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, (flags ^ 0x2) | 0x4);
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else
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st->codec->codec_id = ff_codec_get_id(ff_codec_caf_tags, st->codec->codec_tag);
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return 0;
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}
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/** Read magic cookie chunk */
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static int read_kuki_chunk(AVFormatContext *s, int64_t size)
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{
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AVIOContext *pb = s->pb;
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AVStream *st = s->streams[0];
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if (size < 0 || size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
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return -1;
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if (st->codec->codec_id == CODEC_ID_AAC) {
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/* The magic cookie format for AAC is an mp4 esds atom.
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The lavc AAC decoder requires the data from the codec specific
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description as extradata input. */
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int strt, skip;
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MOVAtom atom;
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strt = avio_tell(pb);
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ff_mov_read_esds(s, pb, atom);
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skip = size - (avio_tell(pb) - strt);
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if (skip < 0 || !st->codec->extradata ||
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st->codec->codec_id != CODEC_ID_AAC) {
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av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n");
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return AVERROR_INVALIDDATA;
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}
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avio_skip(pb, skip);
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} else if (st->codec->codec_id == CODEC_ID_ALAC) {
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#define ALAC_PREAMBLE 12
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#define ALAC_HEADER 36
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#define ALAC_NEW_KUKI 24
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uint8_t preamble[12];
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if (size < ALAC_NEW_KUKI) {
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av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
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avio_skip(pb, size);
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return AVERROR_INVALIDDATA;
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}
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avio_read(pb, preamble, ALAC_PREAMBLE);
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st->codec->extradata = av_mallocz(ALAC_HEADER + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!st->codec->extradata)
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return AVERROR(ENOMEM);
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/* For the old style cookie, we skip 12 bytes, then read 36 bytes.
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* The new style cookie only contains the last 24 bytes of what was
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* 36 bytes in the old style cookie, so we fabricate the first 12 bytes
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* in that case to maintain compatibility. */
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if (!memcmp(&preamble[4], "frmaalac", 8)) {
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if (size < ALAC_PREAMBLE + ALAC_HEADER) {
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av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
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av_freep(&st->codec->extradata);
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return AVERROR_INVALIDDATA;
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}
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avio_read(pb, st->codec->extradata, ALAC_HEADER);
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avio_skip(pb, size - ALAC_PREAMBLE - ALAC_HEADER);
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} else {
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AV_WB32(st->codec->extradata, 36);
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memcpy(&st->codec->extradata[4], "alac", 4);
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AV_WB32(&st->codec->extradata[8], 0);
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memcpy(&st->codec->extradata[12], preamble, 12);
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avio_read(pb, &st->codec->extradata[24], ALAC_NEW_KUKI - 12);
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avio_skip(pb, size - ALAC_NEW_KUKI);
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}
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st->codec->extradata_size = ALAC_HEADER;
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} else {
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st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!st->codec->extradata)
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return AVERROR(ENOMEM);
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avio_read(pb, st->codec->extradata, size);
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st->codec->extradata_size = size;
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}
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return 0;
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}
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/** Read packet table chunk */
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static int read_pakt_chunk(AVFormatContext *s, int64_t size)
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{
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AVIOContext *pb = s->pb;
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AVStream *st = s->streams[0];
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CaffContext *caf = s->priv_data;
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int64_t pos = 0, ccount, num_packets;
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int i;
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ccount = avio_tell(pb);
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num_packets = avio_rb64(pb);
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if (num_packets < 0 || INT32_MAX / sizeof(AVIndexEntry) < num_packets)
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return AVERROR_INVALIDDATA;
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st->nb_frames = avio_rb64(pb); /* valid frames */
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st->nb_frames += avio_rb32(pb); /* priming frames */
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st->nb_frames += avio_rb32(pb); /* remainder frames */
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st->duration = 0;
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for (i = 0; i < num_packets; i++) {
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av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME);
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pos += caf->bytes_per_packet ? caf->bytes_per_packet : ff_mp4_read_descr_len(pb);
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st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb);
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}
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if (avio_tell(pb) - ccount > size) {
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av_log(s, AV_LOG_ERROR, "error reading packet table\n");
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return AVERROR_INVALIDDATA;
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}
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avio_skip(pb, ccount + size - avio_tell(pb));
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caf->num_bytes = pos;
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return 0;
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}
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/** Read information chunk */
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static void read_info_chunk(AVFormatContext *s, int64_t size)
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{
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AVIOContext *pb = s->pb;
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unsigned int i;
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unsigned int nb_entries = avio_rb32(pb);
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for (i = 0; i < nb_entries; i++) {
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char key[32];
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char value[1024];
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avio_get_str(pb, INT_MAX, key, sizeof(key));
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avio_get_str(pb, INT_MAX, value, sizeof(value));
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av_dict_set(&s->metadata, key, value, 0);
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}
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}
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static int read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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CaffContext *caf = s->priv_data;
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AVStream *st;
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uint32_t tag = 0;
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int found_data, ret;
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int64_t size;
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avio_skip(pb, 8); /* magic, version, file flags */
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/* audio description chunk */
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if (avio_rb32(pb) != MKBETAG('d','e','s','c')) {
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av_log(s, AV_LOG_ERROR, "desc chunk not present\n");
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return AVERROR_INVALIDDATA;
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}
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size = avio_rb64(pb);
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if (size != 32)
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return AVERROR_INVALIDDATA;
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ret = read_desc_chunk(s);
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if (ret)
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return ret;
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st = s->streams[0];
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/* parse each chunk */
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found_data = 0;
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while (!url_feof(pb)) {
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/* stop at data chunk if seeking is not supported or
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data chunk size is unknown */
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if (found_data && (caf->data_size < 0 || !pb->seekable))
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break;
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tag = avio_rb32(pb);
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size = avio_rb64(pb);
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if (url_feof(pb))
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break;
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switch (tag) {
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case MKBETAG('d','a','t','a'):
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avio_skip(pb, 4); /* edit count */
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caf->data_start = avio_tell(pb);
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caf->data_size = size < 0 ? -1 : size - 4;
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if (caf->data_size > 0 && pb->seekable)
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avio_skip(pb, caf->data_size);
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found_data = 1;
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break;
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case MKBETAG('c','h','a','n'):
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if ((ret = ff_mov_read_chan(s, st, size)) < 0)
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return ret;
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break;
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/* magic cookie chunk */
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case MKBETAG('k','u','k','i'):
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if (read_kuki_chunk(s, size))
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return AVERROR_INVALIDDATA;
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break;
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/* packet table chunk */
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case MKBETAG('p','a','k','t'):
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if (read_pakt_chunk(s, size))
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return AVERROR_INVALIDDATA;
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break;
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case MKBETAG('i','n','f','o'):
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read_info_chunk(s, size);
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break;
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default:
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#define _(x) ((x) >= ' ' ? (x) : ' ')
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av_log(s, AV_LOG_WARNING, "skipping CAF chunk: %08X (%c%c%c%c), size %"PRId64"\n",
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tag, _(tag>>24), _((tag>>16)&0xFF), _((tag>>8)&0xFF), _(tag&0xFF), size);
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#undef _
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case MKBETAG('f','r','e','e'):
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if (size < 0)
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return AVERROR_INVALIDDATA;
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avio_skip(pb, size);
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break;
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}
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}
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if (!found_data)
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return AVERROR_INVALIDDATA;
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if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
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if (caf->data_size > 0)
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st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet;
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} else if (st->nb_index_entries) {
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st->codec->bit_rate = st->codec->sample_rate * caf->data_size * 8 /
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st->duration;
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} else {
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av_log(s, AV_LOG_ERROR, "Missing packet table. It is required when "
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"block size or frame size are variable.\n");
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return AVERROR_INVALIDDATA;
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}
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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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/* position the stream at the start of data */
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if (caf->data_size >= 0)
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avio_seek(pb, caf->data_start, SEEK_SET);
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return 0;
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}
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#define CAF_MAX_PKT_SIZE 4096
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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AVStream *st = s->streams[0];
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CaffContext *caf = s->priv_data;
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int res, pkt_size = 0, pkt_frames = 0;
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int64_t left = CAF_MAX_PKT_SIZE;
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if (url_feof(pb))
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return AVERROR(EIO);
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/* don't read past end of data chunk */
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if (caf->data_size > 0) {
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left = (caf->data_start + caf->data_size) - avio_tell(pb);
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if (left <= 0)
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return AVERROR(EIO);
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}
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pkt_frames = caf->frames_per_packet;
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pkt_size = caf->bytes_per_packet;
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if (pkt_size > 0 && pkt_frames == 1) {
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pkt_size = (CAF_MAX_PKT_SIZE / pkt_size) * pkt_size;
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pkt_size = FFMIN(pkt_size, left);
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pkt_frames = pkt_size / caf->bytes_per_packet;
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} else if (st->nb_index_entries) {
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if (caf->packet_cnt < st->nb_index_entries - 1) {
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pkt_size = st->index_entries[caf->packet_cnt + 1].pos - st->index_entries[caf->packet_cnt].pos;
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pkt_frames = st->index_entries[caf->packet_cnt + 1].timestamp - st->index_entries[caf->packet_cnt].timestamp;
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} else if (caf->packet_cnt == st->nb_index_entries - 1) {
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pkt_size = caf->num_bytes - st->index_entries[caf->packet_cnt].pos;
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pkt_frames = st->duration - st->index_entries[caf->packet_cnt].timestamp;
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} else {
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return AVERROR(EIO);
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}
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}
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if (pkt_size == 0 || pkt_frames == 0 || pkt_size > left)
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return AVERROR(EIO);
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res = av_get_packet(pb, pkt, pkt_size);
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if (res < 0)
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return res;
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pkt->size = res;
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pkt->stream_index = 0;
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pkt->dts = pkt->pts = caf->frame_cnt;
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caf->packet_cnt++;
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caf->frame_cnt += pkt_frames;
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return 0;
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}
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static int read_seek(AVFormatContext *s, int stream_index,
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int64_t timestamp, int flags)
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{
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AVStream *st = s->streams[0];
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CaffContext *caf = s->priv_data;
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int64_t pos, packet_cnt, frame_cnt;
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timestamp = FFMAX(timestamp, 0);
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if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
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/* calculate new byte position based on target frame position */
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pos = caf->bytes_per_packet * timestamp / caf->frames_per_packet;
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if (caf->data_size > 0)
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pos = FFMIN(pos, caf->data_size);
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packet_cnt = pos / caf->bytes_per_packet;
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frame_cnt = caf->frames_per_packet * packet_cnt;
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} else if (st->nb_index_entries) {
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packet_cnt = av_index_search_timestamp(st, timestamp, flags);
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frame_cnt = st->index_entries[packet_cnt].timestamp;
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pos = st->index_entries[packet_cnt].pos;
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} else {
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return -1;
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}
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if (avio_seek(s->pb, pos + caf->data_start, SEEK_SET) < 0)
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return -1;
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caf->packet_cnt = packet_cnt;
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caf->frame_cnt = frame_cnt;
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return 0;
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}
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AVInputFormat ff_caf_demuxer = {
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.name = "caf",
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.long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
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.priv_data_size = sizeof(CaffContext),
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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.read_seek = read_seek,
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.codec_tag = (const AVCodecTag* const []){ ff_codec_caf_tags, 0 },
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};
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