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ffmpeg/libavcodec/libopusenc.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Opus encoder using libopus
* Copyright (c) 2012 Nathan Caldwell
*
* 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 <opus.h>
#include <opus_multistream.h>
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "encode.h"
#include "libopus.h"
#include "audio_frame_queue.h"
#include "vorbis_data.h"
typedef struct LibopusEncOpts {
int vbr;
int application;
int packet_loss;
int fec;
int complexity;
float frame_duration;
int packet_size;
int max_bandwidth;
int mapping_family;
#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
int apply_phase_inv;
#endif
} LibopusEncOpts;
typedef struct LibopusEncContext {
AVClass *class;
OpusMSEncoder *enc;
int stream_count;
uint8_t *samples;
LibopusEncOpts opts;
AudioFrameQueue afq;
const uint8_t *encoder_channel_map;
} LibopusEncContext;
static const uint8_t opus_coupled_streams[8] = {
0, 1, 1, 2, 2, 2, 2, 3
};
/* Opus internal to Vorbis channel order mapping written in the header */
static const uint8_t opus_vorbis_channel_map[8][8] = {
{ 0 },
{ 0, 1 },
{ 0, 2, 1 },
{ 0, 1, 2, 3 },
{ 0, 4, 1, 2, 3 },
{ 0, 4, 1, 2, 3, 5 },
{ 0, 4, 1, 2, 3, 5, 6 },
{ 0, 6, 1, 2, 3, 4, 5, 7 },
};
/* libavcodec to libopus channel order mapping, passed to libopus */
static const uint8_t libavcodec_libopus_channel_map[8][8] = {
{ 0 },
{ 0, 1 },
{ 0, 1, 2 },
{ 0, 1, 2, 3 },
{ 0, 1, 3, 4, 2 },
{ 0, 1, 4, 5, 2, 3 },
{ 0, 1, 5, 6, 2, 4, 3 },
{ 0, 1, 6, 7, 4, 5, 2, 3 },
};
static void libopus_write_header(AVCodecContext *avctx, int stream_count,
int coupled_stream_count,
int mapping_family,
const uint8_t *channel_mapping)
{
uint8_t *p = avctx->extradata;
int channels = avctx->ch_layout.nb_channels;
bytestream_put_buffer(&p, "OpusHead", 8);
bytestream_put_byte(&p, 1); /* Version */
bytestream_put_byte(&p, channels);
bytestream_put_le16(&p, avctx->initial_padding * 48000 / avctx->sample_rate); /* Lookahead samples at 48kHz */
bytestream_put_le32(&p, avctx->sample_rate); /* Original sample rate */
bytestream_put_le16(&p, 0); /* Gain of 0dB is recommended. */
/* Channel mapping */
bytestream_put_byte(&p, mapping_family);
if (mapping_family != 0) {
bytestream_put_byte(&p, stream_count);
bytestream_put_byte(&p, coupled_stream_count);
bytestream_put_buffer(&p, channel_mapping, channels);
}
}
static int libopus_configure_encoder(AVCodecContext *avctx, OpusMSEncoder *enc,
LibopusEncOpts *opts)
{
int ret;
if (avctx->global_quality) {
av_log(avctx, AV_LOG_ERROR,
"Quality-based encoding not supported, "
"please specify a bitrate and VBR setting.\n");
return AVERROR(EINVAL);
}
ret = opus_multistream_encoder_ctl(enc, OPUS_SET_BITRATE(avctx->bit_rate));
if (ret != OPUS_OK) {
av_log(avctx, AV_LOG_ERROR,
"Failed to set bitrate: %s\n", opus_strerror(ret));
return ret;
}
ret = opus_multistream_encoder_ctl(enc,
OPUS_SET_COMPLEXITY(opts->complexity));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to set complexity: %s\n", opus_strerror(ret));
ret = opus_multistream_encoder_ctl(enc, OPUS_SET_VBR(!!opts->vbr));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to set VBR: %s\n", opus_strerror(ret));
ret = opus_multistream_encoder_ctl(enc,
OPUS_SET_VBR_CONSTRAINT(opts->vbr == 2));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to set constrained VBR: %s\n", opus_strerror(ret));
ret = opus_multistream_encoder_ctl(enc,
OPUS_SET_PACKET_LOSS_PERC(opts->packet_loss));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to set expected packet loss percentage: %s\n",
opus_strerror(ret));
ret = opus_multistream_encoder_ctl(enc,
OPUS_SET_INBAND_FEC(opts->fec));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to set inband FEC: %s\n",
opus_strerror(ret));
if (avctx->cutoff) {
ret = opus_multistream_encoder_ctl(enc,
OPUS_SET_MAX_BANDWIDTH(opts->max_bandwidth));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to set maximum bandwidth: %s\n", opus_strerror(ret));
}
#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
ret = opus_multistream_encoder_ctl(enc,
OPUS_SET_PHASE_INVERSION_DISABLED(!opts->apply_phase_inv));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to set phase inversion: %s\n",
opus_strerror(ret));
#endif
return OPUS_OK;
}
static int libopus_check_max_channels(AVCodecContext *avctx,
int max_channels) {
if (avctx->ch_layout.nb_channels > max_channels) {
av_log(avctx, AV_LOG_ERROR, "Opus mapping family undefined for %d channels.\n",
avctx->ch_layout.nb_channels);
return AVERROR(EINVAL);
}
return 0;
}
static int libopus_check_vorbis_layout(AVCodecContext *avctx, int mapping_family) {
av_assert2(avctx->ch_layout.nb_channels < FF_ARRAY_ELEMS(ff_vorbis_ch_layouts));
if (avctx->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
av_log(avctx, AV_LOG_WARNING,
"No channel layout specified. Opus encoder will use Vorbis "
"channel layout for %d channels.\n", avctx->ch_layout.nb_channels);
} else if (av_channel_layout_compare(&avctx->ch_layout, &ff_vorbis_ch_layouts[avctx->ch_layout.nb_channels - 1])) {
char name[32];
av_channel_layout_describe(&avctx->ch_layout, name, sizeof(name));
av_log(avctx, AV_LOG_ERROR,
"Invalid channel layout %s for specified mapping family %d.\n",
name, mapping_family);
return AVERROR(EINVAL);
}
return 0;
}
static int libopus_validate_layout_and_get_channel_map(
AVCodecContext *avctx,
int mapping_family,
const uint8_t ** channel_map_result)
{
const uint8_t * channel_map = NULL;
int ret;
switch (mapping_family) {
case -1:
ret = libopus_check_max_channels(avctx, 8);
if (ret == 0) {
ret = libopus_check_vorbis_layout(avctx, mapping_family);
/* Channels do not need to be reordered. */
}
break;
case 0:
ret = libopus_check_max_channels(avctx, 2);
if (ret == 0) {
ret = libopus_check_vorbis_layout(avctx, mapping_family);
}
break;
case 1:
/* Opus expects channels to be in Vorbis order. */
ret = libopus_check_max_channels(avctx, 8);
if (ret == 0) {
ret = libopus_check_vorbis_layout(avctx, mapping_family);
channel_map = ff_vorbis_channel_layout_offsets[avctx->ch_layout.nb_channels - 1];
}
break;
case 255:
ret = libopus_check_max_channels(avctx, 254);
break;
default:
av_log(avctx, AV_LOG_WARNING,
"Unknown channel mapping family %d. Output channel layout may be invalid.\n",
mapping_family);
ret = 0;
}
*channel_map_result = channel_map;
return ret;
}
static av_cold int libopus_encode_init(AVCodecContext *avctx)
{
LibopusEncContext *opus = avctx->priv_data;
OpusMSEncoder *enc;
uint8_t libopus_channel_mapping[255];
int ret = OPUS_OK;
int channels = avctx->ch_layout.nb_channels;
int av_ret;
int coupled_stream_count, header_size, frame_size;
int mapping_family;
frame_size = opus->opts.frame_duration * 48000 / 1000;
switch (frame_size) {
case 120:
case 240:
if (opus->opts.application != OPUS_APPLICATION_RESTRICTED_LOWDELAY)
av_log(avctx, AV_LOG_WARNING,
"LPC mode cannot be used with a frame duration of less "
"than 10ms. Enabling restricted low-delay mode.\n"
"Use a longer frame duration if this is not what you want.\n");
/* Frame sizes less than 10 ms can only use MDCT mode, so switching to
* RESTRICTED_LOWDELAY avoids an unnecessary extra 2.5ms lookahead. */
opus->opts.application = OPUS_APPLICATION_RESTRICTED_LOWDELAY;
case 480:
case 960:
case 1920:
case 2880:
#ifdef OPUS_FRAMESIZE_120_MS
case 3840:
case 4800:
case 5760:
#endif
opus->opts.packet_size =
avctx->frame_size = frame_size * avctx->sample_rate / 48000;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid frame duration: %g.\n"
"Frame duration must be exactly one of: 2.5, 5, 10, 20, 40"
#ifdef OPUS_FRAMESIZE_120_MS
", 60, 80, 100 or 120.\n",
#else
" or 60.\n",
#endif
opus->opts.frame_duration);
return AVERROR(EINVAL);
}
if (avctx->compression_level < 0 || avctx->compression_level > 10) {
av_log(avctx, AV_LOG_WARNING,
"Compression level must be in the range 0 to 10. "
"Defaulting to 10.\n");
opus->opts.complexity = 10;
} else {
opus->opts.complexity = avctx->compression_level;
}
if (avctx->cutoff) {
switch (avctx->cutoff) {
case 4000:
opus->opts.max_bandwidth = OPUS_BANDWIDTH_NARROWBAND;
break;
case 6000:
opus->opts.max_bandwidth = OPUS_BANDWIDTH_MEDIUMBAND;
break;
case 8000:
opus->opts.max_bandwidth = OPUS_BANDWIDTH_WIDEBAND;
break;
case 12000:
opus->opts.max_bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND;
break;
case 20000:
opus->opts.max_bandwidth = OPUS_BANDWIDTH_FULLBAND;
break;
default:
av_log(avctx, AV_LOG_WARNING,
"Invalid frequency cutoff: %d. Using default maximum bandwidth.\n"
"Cutoff frequency must be exactly one of: 4000, 6000, 8000, 12000 or 20000.\n",
avctx->cutoff);
avctx->cutoff = 0;
}
}
/* Channels may need to be reordered to match opus mapping. */
av_ret = libopus_validate_layout_and_get_channel_map(avctx, opus->opts.mapping_family,
&opus->encoder_channel_map);
if (av_ret) {
return av_ret;
}
if (opus->opts.mapping_family == -1) {
/* By default, use mapping family 1 for the header but use the older
* libopus multistream API to avoid surround masking. */
/* Set the mapping family so that the value is correct in the header */
mapping_family = channels > 2 ? 1 : 0;
coupled_stream_count = opus_coupled_streams[channels - 1];
opus->stream_count = channels - coupled_stream_count;
memcpy(libopus_channel_mapping,
opus_vorbis_channel_map[channels - 1],
channels * sizeof(*libopus_channel_mapping));
enc = opus_multistream_encoder_create(
avctx->sample_rate, channels, opus->stream_count,
coupled_stream_count,
libavcodec_libopus_channel_map[channels - 1],
opus->opts.application, &ret);
} else {
/* Use the newer multistream API. The encoder will set the channel
* mapping and coupled stream counts to its internal defaults and will
* use surround masking analysis to save bits. */
mapping_family = opus->opts.mapping_family;
enc = opus_multistream_surround_encoder_create(
avctx->sample_rate, channels, mapping_family,
&opus->stream_count, &coupled_stream_count, libopus_channel_mapping,
opus->opts.application, &ret);
}
if (ret != OPUS_OK) {
av_log(avctx, AV_LOG_ERROR,
"Failed to create encoder: %s\n", opus_strerror(ret));
return ff_opus_error_to_averror(ret);
}
if (!avctx->bit_rate) {
/* Sane default copied from opusenc */
avctx->bit_rate = 64000 * opus->stream_count +
32000 * coupled_stream_count;
av_log(avctx, AV_LOG_WARNING,
"No bit rate set. Defaulting to %"PRId64" bps.\n", avctx->bit_rate);
}
if (avctx->bit_rate < 500 || avctx->bit_rate > 256000 * channels) {
av_log(avctx, AV_LOG_ERROR, "The bit rate %"PRId64" bps is unsupported. "
"Please choose a value between 500 and %d.\n", avctx->bit_rate,
256000 * channels);
ret = AVERROR(EINVAL);
goto fail;
}
ret = libopus_configure_encoder(avctx, enc, &opus->opts);
if (ret != OPUS_OK) {
ret = ff_opus_error_to_averror(ret);
goto fail;
}
/* Header includes channel mapping table if and only if mapping family is NOT 0 */
header_size = 19 + (mapping_family == 0 ? 0 : 2 + channels);
avctx->extradata = av_malloc(header_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata) {
av_log(avctx, AV_LOG_ERROR, "Failed to allocate extradata.\n");
ret = AVERROR(ENOMEM);
goto fail;
}
avctx->extradata_size = header_size;
opus->samples = av_calloc(frame_size, channels *
av_get_bytes_per_sample(avctx->sample_fmt));
if (!opus->samples) {
av_log(avctx, AV_LOG_ERROR, "Failed to allocate samples buffer.\n");
ret = AVERROR(ENOMEM);
goto fail;
}
ret = opus_multistream_encoder_ctl(enc, OPUS_GET_LOOKAHEAD(&avctx->initial_padding));
if (ret != OPUS_OK)
av_log(avctx, AV_LOG_WARNING,
"Unable to get number of lookahead samples: %s\n",
opus_strerror(ret));
libopus_write_header(avctx, opus->stream_count, coupled_stream_count,
mapping_family, libopus_channel_mapping);
ff_af_queue_init(avctx, &opus->afq);
opus->enc = enc;
return 0;
fail:
opus_multistream_encoder_destroy(enc);
return ret;
}
static void libopus_copy_samples_with_channel_map(
uint8_t *dst, const uint8_t *src, const uint8_t *channel_map,
int nb_channels, int nb_samples, int bytes_per_sample) {
int sample, channel;
for (sample = 0; sample < nb_samples; ++sample) {
for (channel = 0; channel < nb_channels; ++channel) {
const size_t src_pos = bytes_per_sample * (nb_channels * sample + channel);
const size_t dst_pos = bytes_per_sample * (nb_channels * sample + channel_map[channel]);
memcpy(&dst[dst_pos], &src[src_pos], bytes_per_sample);
}
}
}
static int libopus_encode(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
LibopusEncContext *opus = avctx->priv_data;
const int bytes_per_sample = av_get_bytes_per_sample(avctx->sample_fmt);
const int channels = avctx->ch_layout.nb_channels;
const int sample_size = channels * bytes_per_sample;
const uint8_t *audio;
int ret;
int discard_padding;
if (frame) {
ret = ff_af_queue_add(&opus->afq, frame);
if (ret < 0)
return ret;
if (opus->encoder_channel_map != NULL) {
audio = opus->samples;
libopus_copy_samples_with_channel_map(
opus->samples, frame->data[0], opus->encoder_channel_map,
channels, frame->nb_samples, bytes_per_sample);
} else if (frame->nb_samples < opus->opts.packet_size) {
audio = opus->samples;
memcpy(opus->samples, frame->data[0], frame->nb_samples * sample_size);
} else
audio = frame->data[0];
} else {
if (!opus->afq.remaining_samples || (!opus->afq.frame_alloc && !opus->afq.frame_count))
return 0;
audio = opus->samples;
memset(opus->samples, 0, opus->opts.packet_size * sample_size);
}
/* Maximum packet size taken from opusenc in opus-tools. 120ms packets
* consist of 6 frames in one packet. The maximum frame size is 1275
* bytes along with the largest possible packet header of 7 bytes. */
if ((ret = ff_alloc_packet(avctx, avpkt, (1275 * 6 + 7) * opus->stream_count)) < 0)
return ret;
if (avctx->sample_fmt == AV_SAMPLE_FMT_FLT)
ret = opus_multistream_encode_float(opus->enc, (const float *)audio,
opus->opts.packet_size,
avpkt->data, avpkt->size);
else
ret = opus_multistream_encode(opus->enc, (const opus_int16 *)audio,
opus->opts.packet_size,
avpkt->data, avpkt->size);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"Error encoding frame: %s\n", opus_strerror(ret));
return ff_opus_error_to_averror(ret);
}
av_shrink_packet(avpkt, ret);
ff_af_queue_remove(&opus->afq, opus->opts.packet_size,
&avpkt->pts, &avpkt->duration);
discard_padding = opus->opts.packet_size - avpkt->duration;
// Check if subtraction resulted in an overflow
if ((discard_padding < opus->opts.packet_size) != (avpkt->duration > 0))
return AVERROR(EINVAL);
if (discard_padding > 0) {
uint8_t* side_data = av_packet_new_side_data(avpkt,
AV_PKT_DATA_SKIP_SAMPLES,
10);
if (!side_data)
return AVERROR(ENOMEM);
AV_WL32(side_data + 4, discard_padding);
}
*got_packet_ptr = 1;
return 0;
}
static av_cold int libopus_encode_close(AVCodecContext *avctx)
{
LibopusEncContext *opus = avctx->priv_data;
opus_multistream_encoder_destroy(opus->enc);
ff_af_queue_close(&opus->afq);
av_freep(&opus->samples);
return 0;
}
#define OFFSET(x) offsetof(LibopusEncContext, opts.x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption libopus_options[] = {
{ "application", "Intended application type", OFFSET(application), AV_OPT_TYPE_INT, { .i64 = OPUS_APPLICATION_AUDIO }, OPUS_APPLICATION_VOIP, OPUS_APPLICATION_RESTRICTED_LOWDELAY, FLAGS, .unit = "application" },
{ "voip", "Favor improved speech intelligibility", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_VOIP }, 0, 0, FLAGS, .unit = "application" },
{ "audio", "Favor faithfulness to the input", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_AUDIO }, 0, 0, FLAGS, .unit = "application" },
{ "lowdelay", "Restrict to only the lowest delay modes, disable voice-optimized modes", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_RESTRICTED_LOWDELAY }, 0, 0, FLAGS, .unit = "application" },
{ "frame_duration", "Duration of a frame in milliseconds", OFFSET(frame_duration), AV_OPT_TYPE_FLOAT, { .dbl = 20.0 }, 2.5, 120.0, FLAGS },
{ "packet_loss", "Expected packet loss percentage", OFFSET(packet_loss), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 100, FLAGS },
{ "fec", "Enable inband FEC. Expected packet loss must be non-zero", OFFSET(fec), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "vbr", "Variable bit rate mode", OFFSET(vbr), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 2, FLAGS, .unit = "vbr" },
{ "off", "Use constant bit rate", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, FLAGS, .unit = "vbr" },
{ "on", "Use variable bit rate", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, .unit = "vbr" },
{ "constrained", "Use constrained VBR", 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, 0, 0, FLAGS, .unit = "vbr" },
{ "mapping_family", "Channel Mapping Family", OFFSET(mapping_family), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, FLAGS, .unit = "mapping_family" },
#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
{ "apply_phase_inv", "Apply intensity stereo phase inversion", OFFSET(apply_phase_inv), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
#endif
{ NULL },
};
static const AVClass libopus_class = {
.class_name = "libopus",
.item_name = av_default_item_name,
.option = libopus_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const FFCodecDefault libopus_defaults[] = {
{ "b", "0" },
{ "compression_level", "10" },
{ NULL },
};
static const int libopus_sample_rates[] = {
48000, 24000, 16000, 12000, 8000, 0,
};
const FFCodec ff_libopus_encoder = {
.p.name = "libopus",
CODEC_LONG_NAME("libopus Opus"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_OPUS,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_SMALL_LAST_FRAME,
.caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
.priv_data_size = sizeof(LibopusEncContext),
.init = libopus_encode_init,
FF_CODEC_ENCODE_CB(libopus_encode),
.close = libopus_encode_close,
.p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_FLT,
AV_SAMPLE_FMT_NONE },
.p.supported_samplerates = libopus_sample_rates,
.p.priv_class = &libopus_class,
.defaults = libopus_defaults,
.p.wrapper_name = "libopus",
};
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