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ffmpeg/libavformat/cafenc.c
James Almer aa79d13f51 avformat/cafenc: derive Opus frame size from the relevant stream parameters 
Use the stream duration as last resort, as an off-by-one result of the
"st->duration / (caf->packets - 1)" calculation can break playback on some
devices.
Also, don't write the sample_rate value propagated by encoders like libopus.
The sample rate of the audio fed to it is irrelevant after being encoded.

Fixes ticket #9930.

Signed-off-by: James Almer <jamrial@gmail.com>
2022-09-24 12:16:15 -03:00

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/*
* Core Audio Format muxer
* Copyright (c) 2011 Carl Eugen Hoyos
*
* 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 "avformat.h"
#include "caf.h"
#include "isom.h"
#include "avio_internal.h"
#include "mux.h"
#include "libavutil/intfloat.h"
#include "libavutil/dict.h"
#define FRAME_SIZE_OFFSET 40
typedef struct {
int64_t data;
int size_buffer_size;
int size_entries_used;
int packets;
} CAFContext;
static uint32_t codec_flags(enum AVCodecID codec_id) {
switch (codec_id) {
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_F64BE:
return 1; //< kCAFLinearPCMFormatFlagIsFloat
case AV_CODEC_ID_PCM_S16LE:
case AV_CODEC_ID_PCM_S24LE:
case AV_CODEC_ID_PCM_S32LE:
return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
case AV_CODEC_ID_PCM_F32LE:
case AV_CODEC_ID_PCM_F64LE:
return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
default:
return 0;
}
}
static uint32_t samples_per_packet(const AVCodecParameters *par) {
enum AVCodecID codec_id = par->codec_id;
int channels = par->ch_layout.nb_channels, block_align = par->block_align;
int frame_size = par->frame_size, sample_rate = par->sample_rate;
switch (codec_id) {
case AV_CODEC_ID_PCM_S8:
case AV_CODEC_ID_PCM_S16LE:
case AV_CODEC_ID_PCM_S16BE:
case AV_CODEC_ID_PCM_S24LE:
case AV_CODEC_ID_PCM_S24BE:
case AV_CODEC_ID_PCM_S32LE:
case AV_CODEC_ID_PCM_S32BE:
case AV_CODEC_ID_PCM_F32LE:
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_F64LE:
case AV_CODEC_ID_PCM_F64BE:
case AV_CODEC_ID_PCM_ALAW:
case AV_CODEC_ID_PCM_MULAW:
return 1;
case AV_CODEC_ID_MACE3:
case AV_CODEC_ID_MACE6:
return 6;
case AV_CODEC_ID_ADPCM_IMA_QT:
return 64;
case AV_CODEC_ID_AMR_NB:
case AV_CODEC_ID_GSM:
case AV_CODEC_ID_ILBC:
case AV_CODEC_ID_QCELP:
return 160;
case AV_CODEC_ID_GSM_MS:
return 320;
case AV_CODEC_ID_MP1:
return 384;
case AV_CODEC_ID_OPUS:
return frame_size * 48000 / sample_rate;
case AV_CODEC_ID_MP2:
case AV_CODEC_ID_MP3:
return 1152;
case AV_CODEC_ID_AC3:
return 1536;
case AV_CODEC_ID_QDM2:
case AV_CODEC_ID_QDMC:
return 2048 * channels;
case AV_CODEC_ID_ALAC:
return 4096;
case AV_CODEC_ID_ADPCM_IMA_WAV:
return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
case AV_CODEC_ID_ADPCM_MS:
return (block_align - 7 * channels) * 2 / channels + 2;
default:
return 0;
}
}
static int caf_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[0]->codecpar;
CAFContext *caf = s->priv_data;
AVDictionaryEntry *t = NULL;
unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, par->codec_id);
int64_t chunk_size = 0;
int frame_size = par->frame_size, sample_rate = par->sample_rate;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
return AVERROR(EINVAL);
}
switch (par->codec_id) {
case AV_CODEC_ID_AAC:
av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
return AVERROR_PATCHWELCOME;
}
if (par->codec_id == AV_CODEC_ID_OPUS && par->ch_layout.nb_channels > 2) {
av_log(s, AV_LOG_ERROR, "Only mono and stereo are supported for Opus\n");
return AVERROR_INVALIDDATA;
}
if (!codec_tag) {
av_log(s, AV_LOG_ERROR, "unsupported codec\n");
return AVERROR_INVALIDDATA;
}
if (!par->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
return AVERROR_INVALIDDATA;
}
if (par->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
frame_size = samples_per_packet(par);
if (par->codec_id == AV_CODEC_ID_OPUS)
sample_rate = 48000;
ffio_wfourcc(pb, "caff"); //< mFileType
avio_wb16(pb, 1); //< mFileVersion
avio_wb16(pb, 0); //< mFileFlags
ffio_wfourcc(pb, "desc"); //< Audio Description chunk
avio_wb64(pb, 32); //< mChunkSize
avio_wb64(pb, av_double2int(sample_rate)); //< mSampleRate
avio_wl32(pb, codec_tag); //< mFormatID
avio_wb32(pb, codec_flags(par->codec_id)); //< mFormatFlags
avio_wb32(pb, par->block_align); //< mBytesPerPacket
avio_wb32(pb, frame_size); //< mFramesPerPacket
avio_wb32(pb, par->ch_layout.nb_channels); //< mChannelsPerFrame
avio_wb32(pb, av_get_bits_per_sample(par->codec_id)); //< mBitsPerChannel
if (par->ch_layout.order == AV_CHANNEL_ORDER_NATIVE) {
ffio_wfourcc(pb, "chan");
avio_wb64(pb, 12);
ff_mov_write_chan(pb, par->ch_layout.u.mask);
}
if (par->codec_id == AV_CODEC_ID_ALAC) {
ffio_wfourcc(pb, "kuki");
avio_wb64(pb, 12 + par->extradata_size);
avio_write(pb, "\0\0\0\14frmaalac", 12);
avio_write(pb, par->extradata, par->extradata_size);
} else if (par->codec_id == AV_CODEC_ID_AMR_NB) {
ffio_wfourcc(pb, "kuki");
avio_wb64(pb, 29);
avio_write(pb, "\0\0\0\14frmasamr", 12);
avio_wb32(pb, 0x11); /* size */
avio_write(pb, "samrFFMP", 8);
avio_w8(pb, 0); /* decoder version */
avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
avio_w8(pb, 0x00); /* Mode change period (no restriction) */
avio_w8(pb, 0x01); /* Frames per sample */
} else if (par->codec_id == AV_CODEC_ID_QDM2 || par->codec_id == AV_CODEC_ID_QDMC) {
ffio_wfourcc(pb, "kuki");
avio_wb64(pb, par->extradata_size);
avio_write(pb, par->extradata, par->extradata_size);
}
ff_standardize_creation_time(s);
if (av_dict_count(s->metadata)) {
ffio_wfourcc(pb, "info"); //< Information chunk
while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
chunk_size += strlen(t->key) + strlen(t->value) + 2;
}
avio_wb64(pb, chunk_size + 4);
avio_wb32(pb, av_dict_count(s->metadata));
t = NULL;
while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
avio_put_str(pb, t->key);
avio_put_str(pb, t->value);
}
}
ffio_wfourcc(pb, "data"); //< Audio Data chunk
caf->data = avio_tell(pb);
avio_wb64(pb, -1); //< mChunkSize
avio_wb32(pb, 0); //< mEditCount
return 0;
}
static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
CAFContext *caf = s->priv_data;
AVStream *const st = s->streams[0];
if (!st->codecpar->block_align) {
uint8_t *pkt_sizes;
int i, alloc_size = caf->size_entries_used + 5U;
if (alloc_size < 0)
return AVERROR(ERANGE);
pkt_sizes = av_fast_realloc(st->priv_data,
&caf->size_buffer_size,
alloc_size);
if (!pkt_sizes)
return AVERROR(ENOMEM);
st->priv_data = pkt_sizes;
for (i = 4; i > 0; i--) {
unsigned top = pkt->size >> i * 7;
if (top)
pkt_sizes[caf->size_entries_used++] = 128 | top;
}
pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
caf->packets++;
}
avio_write(s->pb, pkt->data, pkt->size);
return 0;
}
static int caf_write_trailer(AVFormatContext *s)
{
CAFContext *caf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = s->streams[0];
AVCodecParameters *par = st->codecpar;
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
int64_t file_size = avio_tell(pb);
avio_seek(pb, caf->data, SEEK_SET);
avio_wb64(pb, file_size - caf->data - 8);
if (!par->block_align) {
int packet_size = samples_per_packet(par);
if (!packet_size) {
packet_size = st->duration / (caf->packets - 1);
avio_seek(pb, FRAME_SIZE_OFFSET, SEEK_SET);
avio_wb32(pb, packet_size);
}
avio_seek(pb, file_size, SEEK_SET);
ffio_wfourcc(pb, "pakt");
avio_wb64(pb, caf->size_entries_used + 24U);
avio_wb64(pb, caf->packets); ///< mNumberPackets
avio_wb64(pb, caf->packets * packet_size); ///< mNumberValidFrames
avio_wb32(pb, 0); ///< mPrimingFrames
avio_wb32(pb, 0); ///< mRemainderFrames
avio_write(pb, st->priv_data, caf->size_entries_used);
}
}
return 0;
}
const AVOutputFormat ff_caf_muxer = {
.name = "caf",
.long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
.mime_type = "audio/x-caf",
.extensions = "caf",
.priv_data_size = sizeof(CAFContext),
.audio_codec = AV_CODEC_ID_PCM_S16BE,
.video_codec = AV_CODEC_ID_NONE,
.write_header = caf_write_header,
.write_packet = caf_write_packet,
.write_trailer = caf_write_trailer,
.codec_tag = ff_caf_codec_tags_list,
};
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