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FFmpeg/fftools/ffmpeg_enc.c
T
Kacper Michajłow 02abeae2c7 fftools/ffmpeg: add chroma location support 
Carry the chroma location through the filter graph the way the other video
color properties already are. The decoder's value reaches buffersrc, the
encoder's accepted list reaches the sink, and the graph converts between
them.

This also makes an explicit -chroma_sample_location do something useful on
the output side. It used to only tag, and warn when the tag disagreed with
the frame, which is why the warning goes away here.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
2026-10-01 14:31:15 +00:00

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/*
* 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 <math.h>
#include <stdint.h>
#include "ffmpeg.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/avutil.h"
#include "libavutil/dict.h"
#include "libavutil/display.h"
#include "libavutil/eval.h"
#include "libavutil/frame.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/rational.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "libavcodec/avcodec.h"
typedef struct EncoderPriv {
Encoder e;
void *log_parent;
char log_name[32];
// combined size of all the packets received from the encoder
uint64_t data_size;
// number of packets received from the encoder
uint64_t packets_encoded;
int got_first_packet;
int opened;
int attach_par;
Scheduler *sch;
unsigned sch_idx;
} EncoderPriv;
static EncoderPriv *ep_from_enc(Encoder *enc)
{
return (EncoderPriv*)enc;
}
// data that is local to the decoder thread and not visible outside of it
typedef struct EncoderThread {
AVFrame *frame;
AVPacket *pkt;
} EncoderThread;
void enc_free(Encoder **penc)
{
Encoder *enc = *penc;
if (!enc)
return;
if (enc->enc_ctx)
av_freep(&enc->enc_ctx->stats_in);
avcodec_free_context(&enc->enc_ctx);
av_dict_free(&enc->encoder_opts);
av_freep(penc);
}
static const char *enc_item_name(void *obj)
{
const EncoderPriv *ep = obj;
return ep->log_name;
}
static const AVClass enc_class = {
.class_name = "Encoder",
.version = LIBAVUTIL_VERSION_INT,
.parent_log_context_offset = offsetof(EncoderPriv, log_parent),
.item_name = enc_item_name,
};
static int enc_realloc(Encoder *enc, const AVCodec *codec)
{
EncoderPriv *ep = ep_from_enc(enc);
char *stats_in = NULL;
if (enc->enc_ctx)
stats_in = enc->enc_ctx->stats_in;
avcodec_free_context(&enc->enc_ctx);
ep->opened = 0;
ep->got_first_packet = 0;
enc->enc_ctx = avcodec_alloc_context3(codec);
if (!enc->enc_ctx) {
av_freep(&stats_in);
return AVERROR(ENOMEM);
}
enc->enc_ctx->stats_in = stats_in;
return 0;
}
int enc_alloc(Encoder **penc, const AVCodec *codec,
Scheduler *sch, unsigned sch_idx, void *log_parent)
{
EncoderPriv *ep;
int ret = 0;
*penc = NULL;
ep = av_mallocz(sizeof(*ep));
if (!ep)
return AVERROR(ENOMEM);
ep->e.class = &enc_class;
ep->log_parent = log_parent;
ep->sch = sch;
ep->sch_idx = sch_idx;
snprintf(ep->log_name, sizeof(ep->log_name), "enc:%s", codec->name);
ep->e.enc_ctx = avcodec_alloc_context3(codec);
if (!ep->e.enc_ctx) {
ret = AVERROR(ENOMEM);
goto fail;
}
*penc = &ep->e;
return 0;
fail:
enc_free((Encoder**)&ep);
return ret;
}
static int hw_device_setup_for_encode(Encoder *e, AVCodecContext *enc_ctx,
AVBufferRef *frames_ref)
{
const AVCodecHWConfig *config;
HWDevice *dev = NULL;
if (frames_ref &&
((AVHWFramesContext*)frames_ref->data)->format ==
enc_ctx->pix_fmt) {
// Matching format, will try to use hw_frames_ctx.
} else {
frames_ref = NULL;
}
for (int i = 0;; i++) {
config = avcodec_get_hw_config(enc_ctx->codec, i);
if (!config)
break;
if (frames_ref &&
config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX &&
(config->pix_fmt == AV_PIX_FMT_NONE ||
config->pix_fmt == enc_ctx->pix_fmt)) {
av_log(e, AV_LOG_VERBOSE, "Using input "
"frames context (format %s) with %s encoder.\n",
av_get_pix_fmt_name(enc_ctx->pix_fmt),
enc_ctx->codec->name);
enc_ctx->hw_frames_ctx = av_buffer_ref(frames_ref);
if (!enc_ctx->hw_frames_ctx)
return AVERROR(ENOMEM);
return 0;
}
if (!dev &&
config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX)
dev = hw_device_get_by_type(config->device_type);
}
if (dev) {
av_log(e, AV_LOG_VERBOSE, "Using device %s "
"(type %s) with %s encoder.\n", dev->name,
av_hwdevice_get_type_name(dev->type), enc_ctx->codec->name);
enc_ctx->hw_device_ctx = av_buffer_ref(dev->device_ref);
if (!enc_ctx->hw_device_ctx)
return AVERROR(ENOMEM);
} else {
// No device required, or no device available.
}
return 0;
}
static int apply_enc_options(Encoder *e, AVDictionary **opts)
{
AVCodecContext *enc_ctx = e->enc_ctx;
int ret = av_opt_set_dict2(enc_ctx, opts, AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(e, AV_LOG_ERROR, "Error applying encoder options: %s\n",
av_err2str(ret));
return ret;
}
ret = check_avoptions(*opts);
if (ret < 0)
return ret;
return 0;
}
static int enc_reopen(void *opaque, const AVFrame *frame,
AVDictionary **extra_encoder_opts)
{
OutputStream *ost = opaque;
InputStream *ist = ost->ist;
Encoder *e = ost->enc;
EncoderPriv *ep = ep_from_enc(e);
AVCodecContext *enc_ctx = e->enc_ctx;
Decoder *dec = NULL;
const AVCodec *enc = enc_ctx->codec;
AVDictionary *encoder_opts = NULL;
FrameData *fd;
int threads_manual;
int ret;
ret = av_dict_copy(&encoder_opts, ost->enc->encoder_opts, 0);
if (ret < 0)
return ret;
threads_manual = !!av_dict_get(encoder_opts, "threads", NULL, 0);
ret = apply_enc_options(e, &encoder_opts);
av_dict_free(&encoder_opts);
if (ret < 0)
return ret;
if (extra_encoder_opts) {
threads_manual |= !!av_dict_get(*extra_encoder_opts, "threads", NULL, 0);
ret = apply_enc_options(e, extra_encoder_opts);
if (ret < 0)
return ret;
}
// default to automatic thread count
if (!threads_manual)
enc_ctx->thread_count = 0;
// frame is always non-NULL for audio and video
av_assert0(frame || (enc->type != AVMEDIA_TYPE_VIDEO && enc->type != AVMEDIA_TYPE_AUDIO));
if (frame) {
av_assert0(frame->opaque_ref);
fd = (FrameData*)frame->opaque_ref->data;
ret = clone_side_data(&enc_ctx->decoded_side_data, &enc_ctx->nb_decoded_side_data,
fd->side_data, fd->nb_side_data, AV_FRAME_SIDE_DATA_FLAG_UNIQUE);
if (ret < 0)
return ret;
}
if (ist)
dec = ist->decoder;
if (ost->enc->codec_tag)
enc_ctx->codec_tag = e->codec_tag;
enc_ctx->flags |= e->flags;
enc_ctx->flags2 |= e->flags2;
enc_ctx->global_quality = e->global_quality;
// the timebase is chosen by filtering code
if (ost->type == AVMEDIA_TYPE_AUDIO || ost->type == AVMEDIA_TYPE_VIDEO) {
enc_ctx->time_base = frame->time_base;
enc_ctx->framerate = fd->frame_rate_filter;
}
switch (enc_ctx->codec_type) {
case AVMEDIA_TYPE_AUDIO:
av_assert0(frame->format != AV_SAMPLE_FMT_NONE &&
frame->sample_rate > 0 &&
frame->ch_layout.nb_channels > 0);
enc_ctx->sample_fmt = frame->format;
enc_ctx->sample_rate = frame->sample_rate;
if (!enc_ctx->frame_size && (!(enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE) ||
(enc_ctx->flags2 & AV_CODEC_FLAG2_FIXED_FRAME_SIZE)))
enc_ctx->frame_size = frame->nb_samples;
ret = av_channel_layout_copy(&enc_ctx->ch_layout, &frame->ch_layout);
if (ret < 0)
return ret;
if (ost->bits_per_raw_sample)
enc_ctx->bits_per_raw_sample = ost->bits_per_raw_sample;
else
enc_ctx->bits_per_raw_sample = FFMIN(fd->bits_per_raw_sample,
av_get_bytes_per_sample(enc_ctx->sample_fmt) << 3);
break;
case AVMEDIA_TYPE_VIDEO: {
av_assert0(frame->format != AV_PIX_FMT_NONE &&
frame->width > 0 &&
frame->height > 0);
enc_ctx->width = frame->width;
enc_ctx->height = frame->height;
enc_ctx->sample_aspect_ratio =
ost->frame_aspect_ratio.num ? // overridden by the -aspect cli option
av_mul_q(ost->frame_aspect_ratio, (AVRational){ enc_ctx->height, enc_ctx->width }) :
frame->sample_aspect_ratio;
enc_ctx->pix_fmt = frame->format;
if (ost->bits_per_raw_sample)
enc_ctx->bits_per_raw_sample = ost->bits_per_raw_sample;
else
enc_ctx->bits_per_raw_sample = FFMIN(fd->bits_per_raw_sample,
av_pix_fmt_desc_get(enc_ctx->pix_fmt)->comp[0].depth);
/**
* The video color properties should always be in sync with the user-
* requested values, since we forward them to the filter graph.
*/
enc_ctx->color_range = frame->color_range;
enc_ctx->color_primaries = frame->color_primaries;
enc_ctx->color_trc = frame->color_trc;
enc_ctx->colorspace = frame->colorspace;
enc_ctx->alpha_mode = frame->alpha_mode;
enc_ctx->chroma_sample_location = frame->chroma_location;
if (enc_ctx->flags & (AV_CODEC_FLAG_INTERLACED_DCT | AV_CODEC_FLAG_INTERLACED_ME) ||
(frame->flags & AV_FRAME_FLAG_INTERLACED)) {
int top_field_first = !!(frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST);
if (enc->id == AV_CODEC_ID_MJPEG)
enc_ctx->field_order = top_field_first ? AV_FIELD_TT : AV_FIELD_BB;
else
enc_ctx->field_order = top_field_first ? AV_FIELD_TB : AV_FIELD_BT;
} else
enc_ctx->field_order = AV_FIELD_PROGRESSIVE;
break;
}
case AVMEDIA_TYPE_SUBTITLE:
enc_ctx->time_base = AV_TIME_BASE_Q;
if (!enc_ctx->width) {
enc_ctx->width = ost->ist->par->width;
enc_ctx->height = ost->ist->par->height;
}
av_assert0(dec);
if (dec->subtitle_header) {
/* ASS code assumes this buffer is null terminated so add extra byte. */
enc_ctx->subtitle_header = av_mallocz(dec->subtitle_header_size + 1);
if (!enc_ctx->subtitle_header)
return AVERROR(ENOMEM);
memcpy(enc_ctx->subtitle_header, dec->subtitle_header,
dec->subtitle_header_size);
enc_ctx->subtitle_header_size = dec->subtitle_header_size;
}
break;
default:
av_assert0(0);
break;
}
if (ost->bitexact)
enc_ctx->flags |= AV_CODEC_FLAG_BITEXACT;
if (enc->capabilities & AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE)
enc_ctx->flags |= AV_CODEC_FLAG_COPY_OPAQUE;
enc_ctx->flags |= AV_CODEC_FLAG_FRAME_DURATION;
ret = hw_device_setup_for_encode(e, enc_ctx, frame ? frame->hw_frames_ctx : NULL);
if (ret < 0) {
av_log(e, AV_LOG_ERROR,
"Encoding hardware device setup failed: %s\n", av_err2str(ret));
return ret;
}
if ((ret = avcodec_open2(enc_ctx, enc, NULL)) < 0) {
if (ret != AVERROR_EXPERIMENTAL)
av_log(e, AV_LOG_ERROR, "Error while opening encoder - maybe "
"incorrect parameters such as bit_rate, rate, width or height.\n");
return ret;
}
ep->opened = 1;
if (enc_ctx->bit_rate && enc_ctx->bit_rate < 1000 &&
enc_ctx->codec_id != AV_CODEC_ID_CODEC2 /* don't complain about 700 bit/s modes */)
av_log(e, AV_LOG_WARNING, "The bitrate parameter is set too low."
" It takes bits/s as argument, not kbits/s\n");
return 0;
}
int enc_open(void *opaque, const AVFrame *frame)
{
OutputStream *ost = opaque;
Encoder *e = ost->enc;
EncoderPriv *ep = ep_from_enc(e);
AVCodecContext *enc_ctx = e->enc_ctx;
OutputFile *of = ost->file;
int frame_samples = 0;
int ret;
if (ep->opened)
return 0;
ret = enc_reopen(opaque, frame, NULL);
if (ret < 0)
return ret;
if (enc_ctx->frame_size)
frame_samples = enc_ctx->frame_size;
ret = of_stream_init(of, ost, enc_ctx);
if (ret < 0)
return ret;
return frame_samples;
}
static int check_recording_time(OutputStream *ost, int64_t ts, AVRational tb)
{
OutputFile *of = ost->file;
if (of->recording_time != INT64_MAX &&
av_compare_ts(ts, tb, of->recording_time, AV_TIME_BASE_Q) >= 0) {
return 0;
}
return 1;
}
static int do_subtitle_out(OutputFile *of, OutputStream *ost, const AVSubtitle *sub,
AVPacket *pkt)
{
Encoder *e = ost->enc;
EncoderPriv *ep = ep_from_enc(e);
int subtitle_out_max_size = 1024 * 1024;
int subtitle_out_size, nb, i, ret;
AVCodecContext *enc;
int64_t pts;
if (sub->pts == AV_NOPTS_VALUE) {
av_log(e, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
return exit_on_error ? AVERROR(EINVAL) : 0;
}
if ((of->start_time != AV_NOPTS_VALUE && sub->pts < of->start_time))
return 0;
enc = e->enc_ctx;
/* Note: DVB subtitle need one packet to draw them and one other
packet to clear them */
/* XXX: signal it in the codec context ? */
if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
nb = 2;
else if (enc->codec_id == AV_CODEC_ID_ASS)
nb = FFMAX(sub->num_rects, 1);
else
nb = 1;
/* shift timestamp to honor -ss and make check_recording_time() work with -t */
pts = sub->pts;
if (of->start_time != AV_NOPTS_VALUE)
pts -= of->start_time;
for (i = 0; i < nb; i++) {
AVSubtitle local_sub = *sub;
if (!check_recording_time(ost, pts, AV_TIME_BASE_Q))
return AVERROR_EOF;
ret = av_new_packet(pkt, subtitle_out_max_size);
if (ret < 0)
return AVERROR(ENOMEM);
local_sub.pts = pts;
// start_display_time is required to be 0
local_sub.pts += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
local_sub.end_display_time -= sub->start_display_time;
local_sub.start_display_time = 0;
if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE && i == 1)
local_sub.num_rects = 0;
else if (enc->codec_id == AV_CODEC_ID_ASS && sub->num_rects > 0) {
local_sub.num_rects = 1;
local_sub.rects += i;
}
e->frames_encoded++;
subtitle_out_size = avcodec_encode_subtitle(enc, pkt->data, pkt->size, &local_sub);
if (subtitle_out_size < 0) {
av_log(e, AV_LOG_FATAL, "Subtitle encoding failed\n");
return subtitle_out_size;
}
av_shrink_packet(pkt, subtitle_out_size);
pkt->time_base = AV_TIME_BASE_Q;
pkt->pts = pts;
pkt->duration = av_rescale_q(sub->end_display_time, (AVRational){ 1, 1000 }, pkt->time_base);
if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
/* XXX: the pts correction is handled here. Maybe handling
it in the codec would be better */
if (i == 0)
pkt->pts += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, pkt->time_base);
else
pkt->pts += av_rescale_q(sub->end_display_time, (AVRational){ 1, 1000 }, pkt->time_base);
}
pkt->dts = pkt->pts;
ret = sch_enc_send(ep->sch, ep->sch_idx, pkt);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
}
return 0;
}
void enc_stats_write(OutputStream *ost, EncStats *es,
const AVFrame *frame, const AVPacket *pkt,
uint64_t frame_num)
{
Encoder *e = ost->enc;
EncoderPriv *ep = ep_from_enc(e);
AVIOContext *io = es->io;
AVRational tb = frame ? frame->time_base : pkt->time_base;
int64_t pts = frame ? frame->pts : pkt->pts;
AVRational tbi = (AVRational){ 0, 1};
int64_t ptsi = INT64_MAX;
const FrameData *fd = NULL;
if (frame ? frame->opaque_ref : pkt->opaque_ref) {
fd = (const FrameData*)(frame ? frame->opaque_ref->data : pkt->opaque_ref->data);
tbi = fd->dec.tb;
ptsi = fd->dec.pts;
}
pthread_mutex_lock(&es->lock);
for (size_t i = 0; i < es->nb_components; i++) {
const EncStatsComponent *c = &es->components[i];
switch (c->type) {
case ENC_STATS_LITERAL: avio_write (io, c->str, c->str_len); continue;
case ENC_STATS_FILE_IDX: avio_printf(io, "%d", ost->file->index); continue;
case ENC_STATS_STREAM_IDX: avio_printf(io, "%d", ost->index); continue;
case ENC_STATS_TIMEBASE: avio_printf(io, "%d/%d", tb.num, tb.den); continue;
case ENC_STATS_TIMEBASE_IN: avio_printf(io, "%d/%d", tbi.num, tbi.den); continue;
case ENC_STATS_PTS: avio_printf(io, "%"PRId64, pts); continue;
case ENC_STATS_PTS_IN: avio_printf(io, "%"PRId64, ptsi); continue;
case ENC_STATS_PTS_TIME: avio_printf(io, "%g", pts * av_q2d(tb)); continue;
case ENC_STATS_PTS_TIME_IN: avio_printf(io, "%g", ptsi == INT64_MAX ?
INFINITY : ptsi * av_q2d(tbi)); continue;
case ENC_STATS_FRAME_NUM: avio_printf(io, "%"PRIu64, frame_num); continue;
case ENC_STATS_FRAME_NUM_IN: avio_printf(io, "%"PRIu64, fd ? fd->dec.frame_num : -1); continue;
}
if (frame) {
switch (c->type) {
case ENC_STATS_SAMPLE_NUM: avio_printf(io, "%"PRIu64, e->samples_encoded); continue;
case ENC_STATS_NB_SAMPLES: avio_printf(io, "%d", frame->nb_samples); continue;
default: av_assert0(0);
}
} else {
switch (c->type) {
case ENC_STATS_DTS: avio_printf(io, "%"PRId64, pkt->dts); continue;
case ENC_STATS_DTS_TIME: avio_printf(io, "%g", pkt->dts * av_q2d(tb)); continue;
case ENC_STATS_PKT_SIZE: avio_printf(io, "%d", pkt->size); continue;
case ENC_STATS_KEYFRAME: avio_write(io, (pkt->flags & AV_PKT_FLAG_KEY) ?
"K" : "N", 1); continue;
case ENC_STATS_BITRATE: {
double duration = FFMAX(pkt->duration, 1) * av_q2d(tb);
avio_printf(io, "%g", 8.0 * pkt->size / duration);
continue;
}
case ENC_STATS_AVG_BITRATE: {
double duration = pkt->dts * av_q2d(tb);
avio_printf(io, "%g", duration > 0 ? 8.0 * ep->data_size / duration : -1.);
continue;
}
default: av_assert0(0);
}
}
}
avio_w8(io, '\n');
avio_flush(io);
pthread_mutex_unlock(&es->lock);
}
static inline double psnr(double d)
{
return -10.0 * log10(d);
}
static int update_video_stats(OutputStream *ost, const AVPacket *pkt, int write_vstats)
{
Encoder *e = ost->enc;
EncoderPriv *ep = ep_from_enc(e);
const uint8_t *sd = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,
NULL);
AVCodecContext *enc = e->enc_ctx;
enum AVPictureType pict_type;
int64_t frame_number;
double ti1, bitrate, avg_bitrate;
double psnr_val = -1;
int quality;
quality = sd ? AV_RL32(sd) : -1;
pict_type = sd ? sd[4] : AV_PICTURE_TYPE_NONE;
atomic_store(&ost->quality, quality);
if ((enc->flags & AV_CODEC_FLAG_PSNR) && sd && sd[5]) {
// FIXME the scaling assumes 8bit
double error = AV_RL64(sd + 8) / (enc->width * enc->height * 255.0 * 255.0);
if (error >= 0 && error <= 1)
psnr_val = psnr(error);
}
if (!write_vstats)
return 0;
/* this is executed just the first time update_video_stats is called */
if (!vstats_file) {
vstats_file = fopen(vstats_filename, "w");
if (!vstats_file) {
perror("fopen");
return AVERROR(errno);
}
}
frame_number = ep->packets_encoded;
if (vstats_version <= 1) {
fprintf(vstats_file, "frame= %5"PRId64" q= %2.1f ", frame_number,
quality / (float)FF_QP2LAMBDA);
} else {
fprintf(vstats_file, "out= %2d st= %2d frame= %5"PRId64" q= %2.1f ",
ost->file->index, ost->index, frame_number,
quality / (float)FF_QP2LAMBDA);
}
if (psnr_val >= 0)
fprintf(vstats_file, "PSNR= %6.2f ", psnr_val);
fprintf(vstats_file,"f_size= %6d ", pkt->size);
/* compute pts value */
ti1 = pkt->dts * av_q2d(pkt->time_base);
if (ti1 < 0.01)
ti1 = 0.01;
bitrate = (pkt->size * 8) / av_q2d(enc->time_base) / 1000.0;
avg_bitrate = (double)(ep->data_size * 8) / ti1 / 1000.0;
fprintf(vstats_file, "s_size= %8.0fKiB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
(double)ep->data_size / 1024, ti1, bitrate, avg_bitrate);
fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(pict_type));
return 0;
}
static int encode_frame(OutputFile *of, OutputStream *ost, AVFrame *frame,
AVPacket *pkt)
{
Encoder *e = ost->enc;
EncoderPriv *ep = ep_from_enc(e);
AVCodecContext *enc = e->enc_ctx;
const char *type_desc = av_get_media_type_string(enc->codec_type);
const char *action = frame ? "encode" : "flush";
int ret;
if (frame) {
FrameData *fd = frame_data(frame);
if (!fd)
return AVERROR(ENOMEM);
fd->wallclock[LATENCY_PROBE_ENC_PRE] = av_gettime_relative();
if (ost->enc_stats_pre.io)
enc_stats_write(ost, &ost->enc_stats_pre, frame, NULL,
e->frames_encoded);
e->frames_encoded++;
e->samples_encoded += frame->nb_samples;
if (debug_ts) {
av_log(e, AV_LOG_INFO, "encoder <- type:%s "
"frame_pts:%s frame_pts_time:%s time_base:%d/%d\n",
type_desc,
av_ts2str(frame->pts), av_ts2timestr(frame->pts, &enc->time_base),
enc->time_base.num, enc->time_base.den);
}
if (frame->sample_aspect_ratio.num && !ost->frame_aspect_ratio.num)
enc->sample_aspect_ratio = frame->sample_aspect_ratio;
}
update_benchmark(NULL);
ret = avcodec_send_frame(enc, frame);
if (ret < 0 && !(ret == AVERROR_EOF && !frame)) {
av_log(e, AV_LOG_ERROR, "Error submitting %s frame to the encoder\n",
type_desc);
return ret;
}
while (1) {
FrameData *fd;
av_packet_unref(pkt);
ret = avcodec_receive_packet(enc, pkt);
update_benchmark("%s_%s %d.%d", action, type_desc,
of->index, ost->index);
pkt->time_base = enc->time_base;
/* if two pass, output log on success and EOF */
if ((ret >= 0 || ret == AVERROR_EOF) && ost->logfile && enc->stats_out)
fprintf(ost->logfile, "%s", enc->stats_out);
if (ret == AVERROR(EAGAIN)) {
av_assert0(frame); // should never happen during flushing
return 0;
} else if (ret < 0) {
if (ret != AVERROR_EOF)
av_log(e, AV_LOG_ERROR, "%s encoding failed\n", type_desc);
return ret;
}
fd = packet_data(pkt);
if (!fd)
return AVERROR(ENOMEM);
fd->wallclock[LATENCY_PROBE_ENC_POST] = av_gettime_relative();
// attach extradata to first packet if the encoder was reinitialized
if (!ep->got_first_packet && ep->packets_encoded && enc->extradata_size) {
uint8_t *extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
enc->extradata_size);
if (!extradata)
return AVERROR(ENOMEM);
memcpy(extradata, enc->extradata, enc->extradata_size);
ep->got_first_packet = 1;
}
// attach stream parameters to first packet if requested
avcodec_parameters_free(&fd->par_enc);
if (!ep->packets_encoded) {
if (ep->attach_par) {
fd->par_enc = avcodec_parameters_alloc();
if (!fd->par_enc)
return AVERROR(ENOMEM);
ret = avcodec_parameters_from_context(fd->par_enc, enc);
if (ret < 0)
return ret;
}
ep->got_first_packet = 1;
}
pkt->flags |= AV_PKT_FLAG_TRUSTED;
if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
ret = update_video_stats(ost, pkt, !!vstats_filename);
if (ret < 0)
return ret;
}
if (ost->enc_stats_post.io)
enc_stats_write(ost, &ost->enc_stats_post, NULL, pkt,
ep->packets_encoded);
if (debug_ts) {
av_log(e, AV_LOG_INFO, "encoder -> type:%s "
"pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s "
"duration:%s duration_time:%s\n",
type_desc,
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &enc->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &enc->time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, &enc->time_base));
}
ep->data_size += pkt->size;
ep->packets_encoded++;
ret = sch_enc_send(ep->sch, ep->sch_idx, pkt);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
}
av_unreachable("encode_frame() loop should return");
}
static enum AVPictureType forced_kf_apply(void *logctx, KeyframeForceCtx *kf,
const AVFrame *frame)
{
double pts_time;
if (kf->ref_pts == AV_NOPTS_VALUE)
kf->ref_pts = frame->pts;
pts_time = (frame->pts - kf->ref_pts) * av_q2d(frame->time_base);
if (kf->index < kf->nb_pts &&
av_compare_ts(frame->pts, frame->time_base, kf->pts[kf->index], AV_TIME_BASE_Q) >= 0) {
kf->index++;
goto force_keyframe;
} else if (kf->pexpr) {
double res;
kf->expr_const_values[FKF_T] = pts_time;
res = av_expr_eval(kf->pexpr,
kf->expr_const_values, NULL);
av_log(logctx, AV_LOG_TRACE,
"force_key_frame: n:%f n_forced:%f prev_forced_n:%f t:%f prev_forced_t:%f -> res:%f\n",
kf->expr_const_values[FKF_N],
kf->expr_const_values[FKF_N_FORCED],
kf->expr_const_values[FKF_PREV_FORCED_N],
kf->expr_const_values[FKF_T],
kf->expr_const_values[FKF_PREV_FORCED_T],
res);
kf->expr_const_values[FKF_N] += 1;
if (res) {
kf->expr_const_values[FKF_PREV_FORCED_N] = kf->expr_const_values[FKF_N] - 1;
kf->expr_const_values[FKF_PREV_FORCED_T] = kf->expr_const_values[FKF_T];
kf->expr_const_values[FKF_N_FORCED] += 1;
goto force_keyframe;
}
} else if (kf->type == KF_FORCE_SOURCE && (frame->flags & AV_FRAME_FLAG_KEY)) {
goto force_keyframe;
} else if (kf->type == KF_FORCE_SCD_METADATA &&
av_dict_get(frame->metadata, "lavfi.scd.time", NULL, 0)) {
goto force_keyframe;
}
return AV_PICTURE_TYPE_NONE;
force_keyframe:
av_log(logctx, AV_LOG_DEBUG, "Forced keyframe at time %f\n", pts_time);
return AV_PICTURE_TYPE_I;
}
static int frame_encode(OutputStream *ost, AVFrame *frame, AVPacket *pkt)
{
Encoder *e = ost->enc;
OutputFile *of = ost->file;
enum AVMediaType type = ost->type;
if (type == AVMEDIA_TYPE_SUBTITLE) {
const AVSubtitle *subtitle = frame && frame->buf[0] ?
(AVSubtitle*)frame->buf[0]->data : NULL;
// no flushing for subtitles
return subtitle && subtitle->num_rects ?
do_subtitle_out(of, ost, subtitle, pkt) : 0;
}
if (frame) {
if (!check_recording_time(ost, frame->pts, frame->time_base))
return AVERROR_EOF;
if (type == AVMEDIA_TYPE_VIDEO) {
frame->quality = e->enc_ctx->global_quality;
frame->pict_type = forced_kf_apply(e, &ost->kf, frame);
} else {
if (!(e->enc_ctx->codec->capabilities & AV_CODEC_CAP_PARAM_CHANGE) &&
e->enc_ctx->ch_layout.nb_channels != frame->ch_layout.nb_channels) {
av_log(e, AV_LOG_ERROR,
"Audio channel count changed and encoder does not support parameter changes\n");
return 0;
}
}
}
return encode_frame(of, ost, frame, pkt);
}
static void enc_thread_set_name(const OutputStream *ost)
{
char name[16];
snprintf(name, sizeof(name), "enc%d:%d:%s", ost->file->index, ost->index,
ost->enc->enc_ctx->codec->name);
ff_thread_setname(name);
}
static void enc_thread_uninit(EncoderThread *et)
{
av_packet_free(&et->pkt);
av_frame_free(&et->frame);
memset(et, 0, sizeof(*et));
}
static int enc_thread_init(EncoderThread *et)
{
memset(et, 0, sizeof(*et));
et->frame = av_frame_alloc();
if (!et->frame)
goto fail;
et->pkt = av_packet_alloc();
if (!et->pkt)
goto fail;
return 0;
fail:
enc_thread_uninit(et);
return AVERROR(ENOMEM);
}
static int flush_encoder(OutputStream *ost, EncoderThread *et)
{
Encoder *e = ost->enc;
int ret;
ret = frame_encode(ost, NULL, et->pkt);
if (ret < 0 && ret != AVERROR_EOF)
av_log(e, AV_LOG_ERROR, "Error flushing encoder: %s\n",
av_err2str(ret));
return ret;
}
static int reinit_encoder(OutputStream *ost, EncoderThread *et)
{
Encoder *e = ost->enc;
AVDictionary *copy = NULL;
const FrameData *fd = frame_data_c(et->frame);
int force_reinit, ret = AVERROR_BUG;
ret = av_dict_copy(&copy, fd->reinit_opts, 0);
if (ret < 0)
return ret;
force_reinit = !!av_dict_get(copy, "force_reinit", NULL, 0);
if (force_reinit)
av_dict_set(&copy, "force_reinit", NULL, 0);
// Lets try a graceful reconfiguration first
else if (e->enc_ctx->codec->capabilities & AV_CODEC_CAP_ENCODER_RECONF) {
ret = avcodec_encode_reconfigure(e->enc_ctx, &copy);
if (!ret)
goto end;
ret = av_dict_copy(&copy, fd->reinit_opts, AV_DICT_DONT_OVERWRITE);
if (ret < 0)
goto end;
av_dict_set(&copy, "force_reinit", NULL, 0);
av_log(e, AV_LOG_INFO, "Could not reconfigure the encoder."
" Trying to restart it instead\n");
}
// Go ahead and do a full restart of the encoder
ret = flush_encoder(ost, et);
if (ret < 0 && ret != AVERROR_EOF)
goto end;
ret = enc_realloc(e, e->enc_ctx->codec);
if (ret < 0)
goto end;
av_log(e, AV_LOG_DEBUG, "Restarting encoder\n");
ret = enc_reopen(ost, et->frame, &copy);
if (ret < 0)
goto end;
ret = 0;
end:
av_dict_free(&copy);
return ret;
}
int encoder_thread(void *arg)
{
OutputStream *ost = arg;
Encoder *e = ost->enc;
EncoderPriv *ep = ep_from_enc(e);
EncoderThread et;
const FrameData *fd;
int ret = 0, input_status = 0;
int name_set = 0;
ret = enc_thread_init(&et);
if (ret < 0)
goto finish;
/* Open the subtitle encoders immediately. AVFrame-based encoders
* are opened through a callback from the scheduler once they get
* their first frame
*
* N.B.: because the callback is called from a different thread,
* enc_ctx MUST NOT be accessed before sch_enc_receive() returns
* for the first time for audio/video. */
if (ost->type != AVMEDIA_TYPE_VIDEO && ost->type != AVMEDIA_TYPE_AUDIO) {
ret = enc_open(ost, NULL);
if (ret < 0)
goto finish;
}
while (!input_status) {
input_status = sch_enc_receive(ep->sch, ep->sch_idx, et.frame);
if (input_status < 0) {
if (input_status == AVERROR_EOF) {
av_log(e, AV_LOG_VERBOSE, "Encoder thread received EOF\n");
if (ep->opened)
break;
av_log(e, AV_LOG_ERROR, "Could not open encoder before EOF\n");
ret = AVERROR(EINVAL);
} else {
av_log(e, AV_LOG_ERROR, "Error receiving a frame for encoding: %s\n",
av_err2str(ret));
ret = input_status;
}
goto finish;
}
if (!name_set) {
enc_thread_set_name(ost);
name_set = 1;
}
fd = frame_data_c(et.frame);
if (fd && fd->reinit_opts) {
ret = reinit_encoder(ost, &et);
if (ret < 0) {
av_log(e, AV_LOG_ERROR, "Error reconfiguring or restarting encoder: %s\n",
av_err2str(ret));
goto finish;
}
}
ret = frame_encode(ost, et.frame, et.pkt);
av_packet_unref(et.pkt);
av_frame_unref(et.frame);
if (ret < 0) {
if (ret == AVERROR_EOF)
av_log(e, AV_LOG_VERBOSE, "Encoder returned EOF, finishing\n");
else
av_log(e, AV_LOG_ERROR, "Error encoding a frame: %s\n",
av_err2str(ret));
break;
}
}
// flush the encoder
if (ret == 0 || ret == AVERROR_EOF)
ret = flush_encoder(ost, &et);
// EOF is normal thread termination
if (ret == AVERROR_EOF)
ret = 0;
finish:
enc_thread_uninit(&et);
return ret;
}
int enc_loopback(Encoder *enc)
{
EncoderPriv *ep = ep_from_enc(enc);
ep->attach_par = 1;
return ep->sch_idx;
}
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