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mpv/common/encode_lavc.c

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/*
* muxing using libavformat
*
* Copyright (C) 2010 Nicolas George <george@nsup.org>
* Copyright (C) 2011-2012 Rudolf Polzer <divVerent@xonotic.org>
*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libavutil/avutil.h>
#include <libavutil/timestamp.h>
#include "config.h"
#include "encode_lavc.h"
#include "common/av_common.h"
#include "common/global.h"
#include "common/msg.h"
#include "common/msg_control.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "options/options.h"
#include "osdep/timer.h"
#include "video/out/vo.h"
#include "mpv_talloc.h"
#include "stream/stream.h"
struct encode_priv {
struct mp_log *log;
// --- All fields are protected by encode_lavc_context.lock
bool failed;
struct mp_tags *metadata;
AVFormatContext *muxer;
bool header_written; // muxer was initialized
struct mux_stream **streams;
int num_streams;
// Statistics
double t0;
long long abytes;
long long vbytes;
unsigned int frames;
double audioseconds;
};
struct mux_stream {
int index; // index of this into p->streams[]
char name[80];
struct encode_lavc_context *ctx;
enum AVMediaType codec_type;
AVRational encoder_timebase; // packet timestamps from encoder
AVStream *st;
void (*on_ready)(void *ctx); // when finishing muxer init
void *on_ready_ctx;
};
#define OPT_BASE_STRUCT struct encode_opts
const struct m_sub_options encode_config = {
.opts = (const m_option_t[]) {
{"o", OPT_STRING(file), .flags = CONF_NOCFG | CONF_PRE_PARSE | M_OPT_FILE},
{"of", OPT_STRING(format)},
{"ofopts", OPT_KEYVALUELIST(fopts), .flags = M_OPT_HAVE_HELP},
{"ovc", OPT_STRING(vcodec)},
{"ovcopts", OPT_KEYVALUELIST(vopts), .flags = M_OPT_HAVE_HELP},
{"oac", OPT_STRING(acodec)},
{"oacopts", OPT_KEYVALUELIST(aopts), .flags = M_OPT_HAVE_HELP},
{"ovoffset", OPT_FLOAT(voffset), M_RANGE(-1000000.0, 1000000.0),
.deprecation_message = "--audio-delay (once unbroken)"},
{"oaoffset", OPT_FLOAT(aoffset), M_RANGE(-1000000.0, 1000000.0),
.deprecation_message = "--audio-delay (once unbroken)"},
{"orawts", OPT_FLAG(rawts)},
{"ovfirst", OPT_FLAG(video_first),
.deprecation_message = "no replacement"},
{"oafirst", OPT_FLAG(audio_first),
.deprecation_message = "no replacement"},
{"ocopy-metadata", OPT_FLAG(copy_metadata)},
{"oset-metadata", OPT_KEYVALUELIST(set_metadata)},
{"oremove-metadata", OPT_STRINGLIST(remove_metadata)},
{"ocopyts", OPT_REMOVED("ocopyts is now the default")},
{"oneverdrop", OPT_REMOVED("no replacement")},
{"oharddup", OPT_REMOVED("use --vf-add=fps=VALUE")},
{"ofps", OPT_REMOVED("no replacement (use --vf-add=fps=VALUE for CFR)")},
{"oautofps", OPT_REMOVED("no replacement")},
{"omaxfps", OPT_REMOVED("no replacement")},
{0}
},
.size = sizeof(struct encode_opts),
.defaults = &(const struct encode_opts){
.copy_metadata = 1,
},
};
struct encode_lavc_context *encode_lavc_init(struct mpv_global *global)
{
struct encode_lavc_context *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (struct encode_lavc_context){
.global = global,
.options = mp_get_config_group(ctx, global, &encode_config),
.priv = talloc_zero(ctx, struct encode_priv),
.log = mp_log_new(ctx, global->log, "encode"),
};
pthread_mutex_init(&ctx->lock, NULL);
struct encode_priv *p = ctx->priv;
p->log = ctx->log;
const char *filename = ctx->options->file;
// STUPID STUPID STUPID STUPID avio
// does not support "-" as file name to mean stdin/stdout
// ffmpeg.c works around this too, the same way
if (!strcmp(filename, "-"))
filename = "pipe:1";
if (filename && (
!strcmp(filename, "/dev/stdout") ||
!strcmp(filename, "pipe:") ||
!strcmp(filename, "pipe:1")))
mp_msg_force_stderr(global, true);
encode_lavc_discontinuity(ctx);
p->muxer = avformat_alloc_context();
MP_HANDLE_OOM(p->muxer);
if (ctx->options->format && ctx->options->format[0]) {
ctx->oformat = av_guess_format(ctx->options->format, filename, NULL);
} else {
ctx->oformat = av_guess_format(NULL, filename, NULL);
}
if (!ctx->oformat) {
MP_FATAL(ctx, "format not found\n");
goto fail;
}
p->muxer->oformat = ctx->oformat;
p->muxer->url = av_strdup(filename);
MP_HANDLE_OOM(p->muxer->url);
return ctx;
fail:
p->failed = true;
encode_lavc_free(ctx);
return NULL;
}
void encode_lavc_set_metadata(struct encode_lavc_context *ctx,
struct mp_tags *metadata)
{
struct encode_priv *p = ctx->priv;
pthread_mutex_lock(&ctx->lock);
if (ctx->options->copy_metadata) {
p->metadata = mp_tags_dup(ctx, metadata);
} else {
p->metadata = talloc_zero(ctx, struct mp_tags);
}
if (ctx->options->set_metadata) {
char **kv = ctx->options->set_metadata;
// Set all user-provided metadata tags
for (int n = 0; kv[n * 2]; n++) {
MP_VERBOSE(ctx, "setting metadata value '%s' for key '%s'\n",
kv[n*2 + 0], kv[n*2 +1]);
mp_tags_set_str(p->metadata, kv[n*2 + 0], kv[n*2 +1]);
}
}
if (ctx->options->remove_metadata) {
char **k = ctx->options->remove_metadata;
// Remove all user-provided metadata tags
for (int n = 0; k[n]; n++) {
MP_VERBOSE(ctx, "removing metadata key '%s'\n", k[n]);
mp_tags_remove_str(p->metadata, k[n]);
}
}
pthread_mutex_unlock(&ctx->lock);
}
bool encode_lavc_free(struct encode_lavc_context *ctx)
{
bool res = true;
if (!ctx)
return res;
struct encode_priv *p = ctx->priv;
if (!p->failed && !p->header_written) {
MP_FATAL(p, "no data written to target file\n");
p->failed = true;
}
if (!p->failed && p->header_written) {
if (av_write_trailer(p->muxer) < 0)
MP_ERR(p, "error writing trailer\n");
MP_INFO(p, "video: encoded %lld bytes\n", p->vbytes);
MP_INFO(p, "audio: encoded %lld bytes\n", p->abytes);
MP_INFO(p, "muxing overhead %lld bytes\n",
(long long)(avio_size(p->muxer->pb) - p->vbytes - p->abytes));
}
if (avio_closep(&p->muxer->pb) < 0 && !p->failed) {
MP_ERR(p, "Closing file failed\n");
p->failed = true;
}
avformat_free_context(p->muxer);
res = !p->failed;
pthread_mutex_destroy(&ctx->lock);
talloc_free(ctx);
return res;
}
// called locked
static void maybe_init_muxer(struct encode_lavc_context *ctx)
{
struct encode_priv *p = ctx->priv;
if (p->header_written || p->failed)
return;
// Check if all streams were initialized yet. We need data to know the
// AVStream parameters, so we wait for data from _all_ streams before
// starting.
for (int n = 0; n < p->num_streams; n++) {
if (!p->streams[n]->st)
return;
}
if (!(p->muxer->oformat->flags & AVFMT_NOFILE)) {
MP_INFO(p, "Opening output file: %s\n", p->muxer->url);
if (avio_open(&p->muxer->pb, p->muxer->url, AVIO_FLAG_WRITE) < 0) {
MP_FATAL(p, "could not open '%s'\n", p->muxer->url);
goto failed;
}
}
p->t0 = mp_time_sec();
MP_INFO(p, "Opening muxer: %s [%s]\n",
p->muxer->oformat->long_name, p->muxer->oformat->name);
if (p->metadata) {
for (int i = 0; i < p->metadata->num_keys; i++) {
av_dict_set(&p->muxer->metadata,
p->metadata->keys[i], p->metadata->values[i], 0);
}
}
AVDictionary *opts = NULL;
mp_set_avdict(&opts, ctx->options->fopts);
if (avformat_write_header(p->muxer, &opts) < 0) {
MP_FATAL(p, "Failed to initialize muxer.\n");
p->failed = true;
} else {
mp_avdict_print_unset(p->log, MSGL_WARN, opts);
}
av_dict_free(&opts);
if (p->failed)
goto failed;
p->header_written = true;
for (int n = 0; n < p->num_streams; n++) {
struct mux_stream *s = p->streams[n];
if (s->on_ready)
s->on_ready(s->on_ready_ctx);
}
return;
failed:
p->failed = true;
}
// called locked
static struct mux_stream *find_mux_stream(struct encode_lavc_context *ctx,
enum AVMediaType codec_type)
{
struct encode_priv *p = ctx->priv;
for (int n = 0; n < p->num_streams; n++) {
struct mux_stream *s = p->streams[n];
if (s->codec_type == codec_type)
return s;
}
return NULL;
}
void encode_lavc_expect_stream(struct encode_lavc_context *ctx,
enum stream_type type)
{
struct encode_priv *p = ctx->priv;
pthread_mutex_lock(&ctx->lock);
enum AVMediaType codec_type = mp_to_av_stream_type(type);
// These calls are idempotent.
if (find_mux_stream(ctx, codec_type))
goto done;
if (p->header_written) {
MP_ERR(p, "Cannot add a stream during encoding.\n");
p->failed = true;
goto done;
}
struct mux_stream *dst = talloc_ptrtype(p, dst);
*dst = (struct mux_stream){
.index = p->num_streams,
.ctx = ctx,
.codec_type = mp_to_av_stream_type(type),
};
snprintf(dst->name, sizeof(dst->name), "%s", stream_type_name(type));
MP_TARRAY_APPEND(p, p->streams, p->num_streams, dst);
done:
pthread_mutex_unlock(&ctx->lock);
}
// Signal that you are ready to encode (you provide the codec params etc. too).
// This returns a muxing handle which you can use to add encodec packets.
// Can be called only once per stream. info is copied by callee as needed.
static void encode_lavc_add_stream(struct encoder_context *enc,
struct encode_lavc_context *ctx,
struct encoder_stream_info *info,
void (*on_ready)(void *ctx),
void *on_ready_ctx)
{
struct encode_priv *p = ctx->priv;
pthread_mutex_lock(&ctx->lock);
struct mux_stream *dst = find_mux_stream(ctx, info->codecpar->codec_type);
if (!dst) {
MP_ERR(p, "Cannot add a stream at runtime.\n");
p->failed = true;
goto done;
}
if (dst->st) {
// Possibly via --gapless-audio, or explicitly recreating AO/VO.
MP_ERR(p, "Encoder was reinitialized; this is not allowed.\n");
p->failed = true;
dst = NULL;
goto done;
}
dst->st = avformat_new_stream(p->muxer, NULL);
MP_HANDLE_OOM(dst->st);
dst->encoder_timebase = info->timebase;
dst->st->time_base = info->timebase; // lavf will change this on muxer init
// Some muxers (e.g. Matroska one) expect the sample_aspect_ratio to be
// set on the AVStream.
if (info->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
dst->st->sample_aspect_ratio = info->codecpar->sample_aspect_ratio;
if (avcodec_parameters_copy(dst->st->codecpar, info->codecpar) < 0)
MP_HANDLE_OOM(0);
dst->on_ready = on_ready;
dst->on_ready_ctx = on_ready_ctx;
enc->mux_stream = dst;
maybe_init_muxer(ctx);
done:
pthread_mutex_unlock(&ctx->lock);
}
// Write a packet. This will take over ownership of `pkt`
static void encode_lavc_add_packet(struct mux_stream *dst, AVPacket *pkt)
{
struct encode_lavc_context *ctx = dst->ctx;
struct encode_priv *p = ctx->priv;
assert(dst->st);
pthread_mutex_lock(&ctx->lock);
if (p->failed)
goto done;
if (!p->header_written) {
MP_ERR(p, "Encoder trying to write packet before muxer was initialized.\n");
p->failed = true;
goto done;
}
pkt->stream_index = dst->st->index;
assert(dst->st == p->muxer->streams[pkt->stream_index]);
av_packet_rescale_ts(pkt, dst->encoder_timebase, dst->st->time_base);
switch (dst->st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
p->vbytes += pkt->size;
p->frames += 1;
break;
case AVMEDIA_TYPE_AUDIO:
p->abytes += pkt->size;
p->audioseconds += pkt->duration
* (double)dst->st->time_base.num
/ (double)dst->st->time_base.den;
break;
}
if (av_interleaved_write_frame(p->muxer, pkt) < 0) {
MP_ERR(p, "Writing packet failed.\n");
p->failed = true;
}
pkt = NULL;
done:
pthread_mutex_unlock(&ctx->lock);
if (pkt)
av_packet_unref(pkt);
}
AVRational encoder_get_mux_timebase_unlocked(struct encoder_context *p)
{
return p->mux_stream->st->time_base;
}
void encode_lavc_discontinuity(struct encode_lavc_context *ctx)
{
if (!ctx)
return;
pthread_mutex_lock(&ctx->lock);
ctx->discontinuity_pts_offset = MP_NOPTS_VALUE;
pthread_mutex_unlock(&ctx->lock);
}
static void encode_lavc_printoptions(struct mp_log *log, const void *obj,
const char *indent, const char *subindent,
const char *unit, int filter_and,
int filter_eq)
{
const AVOption *opt = NULL;
char optbuf[32];
while ((opt = av_opt_next(obj, opt))) {
// if flags are 0, it simply hasn't been filled in yet and may be
// potentially useful
if (opt->flags)
if ((opt->flags & filter_and) != filter_eq)
continue;
/* Don't print CONST's on level one.
* Don't print anything but CONST's on level two.
* Only print items from the requested unit.
*/
if (!unit && opt->type == AV_OPT_TYPE_CONST) {
continue;
} else if (unit && opt->type != AV_OPT_TYPE_CONST) {
continue;
} else if (unit && opt->type == AV_OPT_TYPE_CONST
&& strcmp(unit, opt->unit))
{
continue;
} else if (unit && opt->type == AV_OPT_TYPE_CONST) {
mp_info(log, "%s", subindent);
} else {
mp_info(log, "%s", indent);
}
switch (opt->type) {
case AV_OPT_TYPE_FLAGS:
snprintf(optbuf, sizeof(optbuf), "%s=<flags>", opt->name);
break;
case AV_OPT_TYPE_INT:
snprintf(optbuf, sizeof(optbuf), "%s=<int>", opt->name);
break;
case AV_OPT_TYPE_INT64:
snprintf(optbuf, sizeof(optbuf), "%s=<int64>", opt->name);
break;
case AV_OPT_TYPE_DOUBLE:
snprintf(optbuf, sizeof(optbuf), "%s=<double>", opt->name);
break;
case AV_OPT_TYPE_FLOAT:
snprintf(optbuf, sizeof(optbuf), "%s=<float>", opt->name);
break;
case AV_OPT_TYPE_STRING:
snprintf(optbuf, sizeof(optbuf), "%s=<string>", opt->name);
break;
case AV_OPT_TYPE_RATIONAL:
snprintf(optbuf, sizeof(optbuf), "%s=<rational>", opt->name);
break;
case AV_OPT_TYPE_BINARY:
snprintf(optbuf, sizeof(optbuf), "%s=<binary>", opt->name);
break;
case AV_OPT_TYPE_CONST:
snprintf(optbuf, sizeof(optbuf), " [+-]%s", opt->name);
break;
default:
snprintf(optbuf, sizeof(optbuf), "%s", opt->name);
break;
}
optbuf[sizeof(optbuf) - 1] = 0;
mp_info(log, "%-32s ", optbuf);
if (opt->help)
mp_info(log, " %s", opt->help);
mp_info(log, "\n");
if (opt->unit && opt->type != AV_OPT_TYPE_CONST)
encode_lavc_printoptions(log, obj, indent, subindent, opt->unit,
filter_and, filter_eq);
}
}
bool encode_lavc_showhelp(struct mp_log *log, struct encode_opts *opts)
{
bool help_output = false;
#define CHECKS(str) ((str) && \
strcmp((str), "help") == 0 ? (help_output |= 1) : 0)
#define CHECKV(strv) ((strv) && (strv)[0] && \
strcmp((strv)[0], "help") == 0 ? (help_output |= 1) : 0)
if (CHECKS(opts->format)) {
const AVOutputFormat *c = NULL;
void *iter = NULL;
mp_info(log, "Available output formats:\n");
while ((c = av_muxer_iterate(&iter))) {
mp_info(log, " --of=%-13s %s\n", c->name,
c->long_name ? c->long_name : "");
}
}
if (CHECKV(opts->fopts)) {
AVFormatContext *c = avformat_alloc_context();
const AVOutputFormat *format = NULL;
mp_info(log, "Available output format ctx->options:\n");
encode_lavc_printoptions(log, c, " --ofopts=", " ", NULL,
AV_OPT_FLAG_ENCODING_PARAM,
AV_OPT_FLAG_ENCODING_PARAM);
av_free(c);
void *iter = NULL;
while ((format = av_muxer_iterate(&iter))) {
if (format->priv_class) {
mp_info(log, "Additionally, for --of=%s:\n",
format->name);
encode_lavc_printoptions(log, &format->priv_class, " --ofopts=",
" ", NULL,
AV_OPT_FLAG_ENCODING_PARAM,
AV_OPT_FLAG_ENCODING_PARAM);
}
}
}
if (CHECKV(opts->vopts)) {
AVCodecContext *c = avcodec_alloc_context3(NULL);
const AVCodec *codec = NULL;
mp_info(log, "Available output video codec ctx->options:\n");
encode_lavc_printoptions(log,
c, " --ovcopts=", " ", NULL,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_VIDEO_PARAM,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_VIDEO_PARAM);
av_free(c);
void *iter = NULL;
while ((codec = av_codec_iterate(&iter))) {
if (!av_codec_is_encoder(codec))
continue;
if (codec->type != AVMEDIA_TYPE_VIDEO)
continue;
if (opts->vcodec && opts->vcodec[0] &&
strcmp(opts->vcodec, codec->name) != 0)
continue;
if (codec->priv_class) {
mp_info(log, "Additionally, for --ovc=%s:\n",
codec->name);
encode_lavc_printoptions(log,
&codec->priv_class, " --ovcopts=",
" ", NULL,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_VIDEO_PARAM,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_VIDEO_PARAM);
}
}
}
if (CHECKV(opts->aopts)) {
AVCodecContext *c = avcodec_alloc_context3(NULL);
const AVCodec *codec = NULL;
mp_info(log, "Available output audio codec ctx->options:\n");
encode_lavc_printoptions(log,
c, " --oacopts=", " ", NULL,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_AUDIO_PARAM,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_AUDIO_PARAM);
av_free(c);
void *iter = NULL;
while ((codec = av_codec_iterate(&iter))) {
if (!av_codec_is_encoder(codec))
continue;
if (codec->type != AVMEDIA_TYPE_AUDIO)
continue;
if (opts->acodec && opts->acodec[0] &&
strcmp(opts->acodec, codec->name) != 0)
continue;
if (codec->priv_class) {
mp_info(log, "Additionally, for --oac=%s:\n",
codec->name);
encode_lavc_printoptions(log,
&codec->priv_class, " --oacopts=",
" ", NULL,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_AUDIO_PARAM,
AV_OPT_FLAG_ENCODING_PARAM |
AV_OPT_FLAG_AUDIO_PARAM);
}
}
}
if (CHECKS(opts->vcodec)) {
const AVCodec *c = NULL;
void *iter = NULL;
mp_info(log, "Available output video codecs:\n");
while ((c = av_codec_iterate(&iter))) {
if (!av_codec_is_encoder(c))
continue;
if (c->type != AVMEDIA_TYPE_VIDEO)
continue;
mp_info(log, " --ovc=%-12s %s\n", c->name,
c->long_name ? c->long_name : "");
}
}
if (CHECKS(opts->acodec)) {
const AVCodec *c = NULL;
void *iter = NULL;
mp_info(log, "Available output audio codecs:\n");
while ((c = av_codec_iterate(&iter))) {
if (!av_codec_is_encoder(c))
continue;
if (c->type != AVMEDIA_TYPE_AUDIO)
continue;
mp_info(log, " --oac=%-12s %s\n", c->name,
c->long_name ? c->long_name : "");
}
}
return help_output;
}
int encode_lavc_getstatus(struct encode_lavc_context *ctx,
char *buf, int bufsize,
float relative_position)
{
if (!ctx)
return -1;
struct encode_priv *p = ctx->priv;
double now = mp_time_sec();
float minutes, megabytes, fps, x;
float f = MPMAX(0.0001, relative_position);
pthread_mutex_lock(&ctx->lock);
if (p->failed) {
snprintf(buf, bufsize, "(failed)\n");
goto done;
}
minutes = (now - p->t0) / 60.0 * (1 - f) / f;
megabytes = p->muxer->pb ? (avio_size(p->muxer->pb) / 1048576.0 / f) : 0;
fps = p->frames / (now - p->t0);
x = p->audioseconds / (now - p->t0);
if (p->frames) {
snprintf(buf, bufsize, "{%.1fmin %.1ffps %.1fMB}",
minutes, fps, megabytes);
} else if (p->audioseconds) {
snprintf(buf, bufsize, "{%.1fmin %.2fx %.1fMB}",
minutes, x, megabytes);
} else {
snprintf(buf, bufsize, "{%.1fmin %.1fMB}",
minutes, megabytes);
}
buf[bufsize - 1] = 0;
done:
pthread_mutex_unlock(&ctx->lock);
return 0;
}
bool encode_lavc_didfail(struct encode_lavc_context *ctx)
{
if (!ctx)
return false;
pthread_mutex_lock(&ctx->lock);
bool fail = ctx->priv->failed;
pthread_mutex_unlock(&ctx->lock);
return fail;
}
static void encoder_destroy(void *ptr)
{
struct encoder_context *p = ptr;
av_packet_free(&p->pkt);
avcodec_free_context(&p->encoder);
free_stream(p->twopass_bytebuffer);
}
static const AVCodec *find_codec_for(struct encode_lavc_context *ctx,
enum stream_type type, bool *used_auto)
{
char *codec_name = type == STREAM_VIDEO
? ctx->options->vcodec
: ctx->options->acodec;
enum AVMediaType codec_type = mp_to_av_stream_type(type);
const char *tname = stream_type_name(type);
*used_auto = !(codec_name && codec_name[0]);
const AVCodec *codec;
if (*used_auto) {
codec = avcodec_find_encoder(av_guess_codec(ctx->oformat, NULL,
ctx->options->file, NULL,
codec_type));
} else {
codec = avcodec_find_encoder_by_name(codec_name);
if (!codec)
MP_FATAL(ctx, "codec '%s' not found.\n", codec_name);
}
if (codec && codec->type != codec_type) {
MP_FATAL(ctx, "codec for %s has wrong media type\n", tname);
codec = NULL;
}
return codec;
}
// Return whether the stream type is "supposed" to work.
bool encode_lavc_stream_type_ok(struct encode_lavc_context *ctx,
enum stream_type type)
{
// If a codec was forced, let it proceed to actual encoding, and then error
// if it doesn't work. (Worried that av_guess_codec() may return NULL for
// some formats where a specific codec works anyway.)
bool auto_codec;
return !!find_codec_for(ctx, type, &auto_codec) || !auto_codec;
}
struct encoder_context *encoder_context_alloc(struct encode_lavc_context *ctx,
enum stream_type type,
struct mp_log *log)
{
if (!ctx) {
mp_err(log, "the option --o (output file) must be specified\n");
return NULL;
}
struct encoder_context *p = talloc_ptrtype(NULL, p);
talloc_set_destructor(p, encoder_destroy);
*p = (struct encoder_context){
.global = ctx->global,
.options = ctx->options,
.oformat = ctx->oformat,
.type = type,
.log = log,
.encode_lavc_ctx = ctx,
};
bool auto_codec;
const AVCodec *codec = find_codec_for(ctx, type, &auto_codec);
const char *tname = stream_type_name(type);
if (!codec) {
if (auto_codec)
MP_FATAL(p, "codec for %s not found\n", tname);
goto fail;
}
p->encoder = avcodec_alloc_context3(codec);
MP_HANDLE_OOM(p->encoder);
return p;
fail:
talloc_free(p);
return NULL;
}
static void encoder_2pass_prepare(struct encoder_context *p)
{
char *filename = talloc_asprintf(NULL, "%s-%s-pass1.log",
p->options->file,
stream_type_name(p->type));
if (p->encoder->flags & AV_CODEC_FLAG_PASS2) {
MP_INFO(p, "Reading 2-pass log: %s\n", filename);
struct stream *s = stream_create(filename,
STREAM_ORIGIN_DIRECT | STREAM_READ,
NULL, p->global);
if (s) {
struct bstr content = stream_read_complete(s, p, 1000000000);
if (content.start) {
p->encoder->stats_in = content.start;
} else {
MP_WARN(p, "could not read '%s', "
"disabling 2-pass encoding at pass 1\n", filename);
}
free_stream(s);
} else {
MP_WARN(p, "could not open '%s', "
"disabling 2-pass encoding at pass 2\n", filename);
p->encoder->flags &= ~(unsigned)AV_CODEC_FLAG_PASS2;
}
}
if (p->encoder->flags & AV_CODEC_FLAG_PASS1) {
MP_INFO(p, "Writing to 2-pass log: %s\n", filename);
p->twopass_bytebuffer = open_output_stream(filename, p->global);
if (!p->twopass_bytebuffer) {
MP_WARN(p, "could not open '%s', "
"disabling 2-pass encoding at pass 1\n", filename);
p->encoder->flags &= ~(unsigned)AV_CODEC_FLAG_PASS1;
}
}
talloc_free(filename);
}
bool encoder_init_codec_and_muxer(struct encoder_context *p,
void (*on_ready)(void *ctx), void *ctx)
{
assert(!avcodec_is_open(p->encoder));
char **copts = p->type == STREAM_VIDEO
? p->options->vopts
: p->options->aopts;
// Set these now, so the code below can read back parsed settings from it.
mp_set_avopts(p->log, p->encoder, copts);
encoder_2pass_prepare(p);
if (p->oformat->flags & AVFMT_GLOBALHEADER)
p->encoder->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
MP_INFO(p, "Opening encoder: %s [%s]\n",
p->encoder->codec->long_name, p->encoder->codec->name);
if (p->encoder->codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL) {
p->encoder->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
MP_WARN(p, "\n\n"
" ********************************************\n"
" **** Experimental codec selected! ****\n"
" ********************************************\n\n"
"This means the output file may be broken or bad.\n"
"Possible reasons, problems, workarounds:\n"
"- Codec implementation in ffmpeg/libav is not finished yet.\n"
" Try updating ffmpeg or libav.\n"
"- Bad picture quality, blocks, blurriness.\n"
" Experiment with codec settings to maybe still get the\n"
" desired quality output at the expense of bitrate.\n"
"- Broken files.\n"
" May not work at all, or break with other software.\n"
"- Slow compression.\n"
" Bear with it.\n"
"- Crashes.\n"
" Happens. Try varying options to work around.\n"
"If none of this helps you, try another codec in place of %s.\n\n",
p->encoder->codec->name);
}
if (avcodec_open2(p->encoder, p->encoder->codec, NULL) < 0) {
MP_FATAL(p, "Could not initialize encoder.\n");
goto fail;
}
p->info.timebase = p->encoder->time_base; // (_not_ changed by enc. init)
p->info.codecpar = avcodec_parameters_alloc();
MP_HANDLE_OOM(p->info.codecpar);
if (avcodec_parameters_from_context(p->info.codecpar, p->encoder) < 0)
goto fail;
p->pkt = av_packet_alloc();
MP_HANDLE_OOM(p->pkt);
encode_lavc_add_stream(p, p->encode_lavc_ctx, &p->info, on_ready, ctx);
if (!p->mux_stream)
goto fail;
return true;
fail:
avcodec_close(p->encoder);
return false;
}
bool encoder_encode(struct encoder_context *p, AVFrame *frame)
{
int status = avcodec_send_frame(p->encoder, frame);
if (status < 0) {
if (frame && status == AVERROR_EOF)
MP_ERR(p, "new data after sending EOF to encoder\n");
goto fail;
}
AVPacket *packet = p->pkt;
for (;;) {
status = avcodec_receive_packet(p->encoder, packet);
if (status == AVERROR(EAGAIN))
break;
if (status < 0 && status != AVERROR_EOF)
goto fail;
if (p->twopass_bytebuffer && p->encoder->stats_out) {
stream_write_buffer(p->twopass_bytebuffer, p->encoder->stats_out,
strlen(p->encoder->stats_out));
}
if (status == AVERROR_EOF)
break;
encode_lavc_add_packet(p->mux_stream, packet);
}
return true;
fail:
MP_ERR(p, "error encoding at %s\n",
frame ? av_ts2timestr(frame->pts, &p->encoder->time_base) : "EOF");
return false;
}
double encoder_get_offset(struct encoder_context *p)
{
switch (p->encoder->codec_type) {
case AVMEDIA_TYPE_VIDEO: return p->options->voffset;
case AVMEDIA_TYPE_AUDIO: return p->options->aoffset;
default: return 0;
}
}
// vim: ts=4 sw=4 et
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