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ffmpeg_opt.c
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/*
* ffmpeg option parsing
*
* 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 <stdint.h>
#include "ffmpeg.h"
#include "cmdutils.h"
#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
#include "libavfilter/avfilter.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/avutil.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/fifo.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#define MATCH_PER_STREAM_OPT(name, type, outvar, fmtctx, st)\
{\
int i, ret;\
for (i = 0; i < o->nb_ ## name; i++) {\
char *spec = o->name[i].specifier;\
if ((ret = check_stream_specifier(fmtctx, st, spec)) > 0)\
outvar = o->name[i].u.type;\
else if (ret < 0)\
exit_program(1);\
}\
}
#define MATCH_PER_TYPE_OPT(name, type, outvar, fmtctx, mediatype)\
{\
int i;\
for (i = 0; i < o->nb_ ## name; i++) {\
char *spec = o->name[i].specifier;\
if (!strcmp(spec, mediatype))\
outvar = o->name[i].u.type;\
}\
}
const HWAccel hwaccels[] = {
#if HAVE_VDPAU_X11
{ "vdpau", vdpau_init, HWACCEL_VDPAU, AV_PIX_FMT_VDPAU },
#endif
#if HAVE_DXVA2_LIB
{ "dxva2", dxva2_init, HWACCEL_DXVA2, AV_PIX_FMT_DXVA2_VLD },
#endif
#if CONFIG_VDA
{ "vda", vda_init, HWACCEL_VDA, AV_PIX_FMT_VDA },
#endif
{ 0 },
};
char *vstats_filename;
float audio_drift_threshold = 0.1;
float dts_delta_threshold = 10;
float dts_error_threshold = 3600*30;
int audio_volume = 256;
int audio_sync_method = 0;
int video_sync_method = VSYNC_AUTO;
int do_deinterlace = 0;
int do_benchmark = 0;
int do_benchmark_all = 0;
int do_hex_dump = 0;
int do_pkt_dump = 0;
int copy_ts = 0;
int start_at_zero = 0;
int copy_tb = -1;
int debug_ts = 0;
int exit_on_error = 0;
int print_stats = -1;
int qp_hist = 0;
int stdin_interaction = 1;
int frame_bits_per_raw_sample = 0;
float max_error_rate = 2.0/3;
static int intra_only = 0;
static int file_overwrite = 0;
static int no_file_overwrite = 0;
static int do_psnr = 0;
static int input_sync;
static int override_ffserver = 0;
static void uninit_options(OptionsContext *o)
{
const OptionDef *po = options;
int i;
/* all OPT_SPEC and OPT_STRING can be freed in generic way */
while (po->name) {
void *dst = (uint8_t*)o + po->u.off;
if (po->flags & OPT_SPEC) {
SpecifierOpt **so = dst;
int i, *count = (int*)(so + 1);
for (i = 0; i < *count; i++) {
av_freep(&(*so)[i].specifier);
if (po->flags & OPT_STRING)
av_freep(&(*so)[i].u.str);
}
av_freep(so);
*count = 0;
} else if (po->flags & OPT_OFFSET && po->flags & OPT_STRING)
av_freep(dst);
po++;
}
for (i = 0; i < o->nb_stream_maps; i++)
av_freep(&o->stream_maps[i].linklabel);
av_freep(&o->stream_maps);
av_freep(&o->audio_channel_maps);
av_freep(&o->streamid_map);
av_freep(&o->attachments);
}
static void init_options(OptionsContext *o)
{
memset(o, 0, sizeof(*o));
o->stop_time = INT64_MAX;
o->mux_max_delay = 0.7;
o->start_time = AV_NOPTS_VALUE;
o->recording_time = INT64_MAX;
o->limit_filesize = UINT64_MAX;
o->chapters_input_file = INT_MAX;
o->accurate_seek = 1;
}
/* return a copy of the input with the stream specifiers removed from the keys */
static AVDictionary *strip_specifiers(AVDictionary *dict)
{
AVDictionaryEntry *e = NULL;
AVDictionary *ret = NULL;
while ((e = av_dict_get(dict, "", e, AV_DICT_IGNORE_SUFFIX))) {
char *p = strchr(e->key, ':');
if (p)
*p = 0;
av_dict_set(&ret, e->key, e->value, 0);
if (p)
*p = ':';
}
return ret;
}
static int opt_sameq(void *optctx, const char *opt, const char *arg)
{
av_log(NULL, AV_LOG_ERROR, "Option '%s' was removed. "
"If you are looking for an option to preserve the quality (which is not "
"what -%s was for), use -qscale 0 or an equivalent quality factor option.\n",
opt, opt);
return AVERROR(EINVAL);
}
static int opt_video_channel(void *optctx, const char *opt, const char *arg)
{
av_log(NULL, AV_LOG_WARNING, "This option is deprecated, use -channel.\n");
return opt_default(optctx, "channel", arg);
}
static int opt_video_standard(void *optctx, const char *opt, const char *arg)
{
av_log(NULL, AV_LOG_WARNING, "This option is deprecated, use -standard.\n");
return opt_default(optctx, "standard", arg);
}
static int opt_audio_codec(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
return parse_option(o, "codec:a", arg, options);
}
static int opt_video_codec(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
return parse_option(o, "codec:v", arg, options);
}
static int opt_subtitle_codec(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
return parse_option(o, "codec:s", arg, options);
}
static int opt_data_codec(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
return parse_option(o, "codec:d", arg, options);
}
static int opt_map(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
StreamMap *m = NULL;
int i, negative = 0, file_idx;
int sync_file_idx = -1, sync_stream_idx = 0;
char *p, *sync;
char *map;
if (*arg == '-') {
negative = 1;
arg++;
}
map = av_strdup(arg);
/* parse sync stream first, just pick first matching stream */
if (sync = strchr(map, ',')) {
*sync = 0;
sync_file_idx = strtol(sync + 1, &sync, 0);
if (sync_file_idx >= nb_input_files || sync_file_idx < 0) {
av_log(NULL, AV_LOG_FATAL, "Invalid sync file index: %d.\n", sync_file_idx);
exit_program(1);
}
if (*sync)
sync++;
for (i = 0; i < input_files[sync_file_idx]->nb_streams; i++)
if (check_stream_specifier(input_files[sync_file_idx]->ctx,
input_files[sync_file_idx]->ctx->streams[i], sync) == 1) {
sync_stream_idx = i;
break;
}
if (i == input_files[sync_file_idx]->nb_streams) {
av_log(NULL, AV_LOG_FATAL, "Sync stream specification in map %s does not "
"match any streams.\n", arg);
exit_program(1);
}
}
if (map[0] == '[') {
/* this mapping refers to lavfi output */
const char *c = map + 1;
GROW_ARRAY(o->stream_maps, o->nb_stream_maps);
m = &o->stream_maps[o->nb_stream_maps - 1];
m->linklabel = av_get_token(&c, "]");
if (!m->linklabel) {
av_log(NULL, AV_LOG_ERROR, "Invalid output link label: %s.\n", map);
exit_program(1);
}
} else {
file_idx = strtol(map, &p, 0);
if (file_idx >= nb_input_files || file_idx < 0) {
av_log(NULL, AV_LOG_FATAL, "Invalid input file index: %d.\n", file_idx);
exit_program(1);
}
if (negative)
/* disable some already defined maps */
for (i = 0; i < o->nb_stream_maps; i++) {
m = &o->stream_maps[i];
if (file_idx == m->file_index &&
check_stream_specifier(input_files[m->file_index]->ctx,
input_files[m->file_index]->ctx->streams[m->stream_index],
*p == ':' ? p + 1 : p) > 0)
m->disabled = 1;
}
else
for (i = 0; i < input_files[file_idx]->nb_streams; i++) {
if (check_stream_specifier(input_files[file_idx]->ctx, input_files[file_idx]->ctx->streams[i],
*p == ':' ? p + 1 : p) <= 0)
continue;
GROW_ARRAY(o->stream_maps, o->nb_stream_maps);
m = &o->stream_maps[o->nb_stream_maps - 1];
m->file_index = file_idx;
m->stream_index = i;
if (sync_file_idx >= 0) {
m->sync_file_index = sync_file_idx;
m->sync_stream_index = sync_stream_idx;
} else {
m->sync_file_index = file_idx;
m->sync_stream_index = i;
}
}
}
if (!m) {
av_log(NULL, AV_LOG_FATAL, "Stream map '%s' matches no streams.\n", arg);
exit_program(1);
}
av_freep(&map);
return 0;
}
static int opt_attach(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
GROW_ARRAY(o->attachments, o->nb_attachments);
o->attachments[o->nb_attachments - 1] = arg;
return 0;
}
static int opt_map_channel(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
int n;
AVStream *st;
AudioChannelMap *m;
GROW_ARRAY(o->audio_channel_maps, o->nb_audio_channel_maps);
m = &o->audio_channel_maps[o->nb_audio_channel_maps - 1];
/* muted channel syntax */
n = sscanf(arg, "%d:%d.%d", &m->channel_idx, &m->ofile_idx, &m->ostream_idx);
if ((n == 1 || n == 3) && m->channel_idx == -1) {
m->file_idx = m->stream_idx = -1;
if (n == 1)
m->ofile_idx = m->ostream_idx = -1;
return 0;
}
/* normal syntax */
n = sscanf(arg, "%d.%d.%d:%d.%d",
&m->file_idx, &m->stream_idx, &m->channel_idx,
&m->ofile_idx, &m->ostream_idx);
if (n != 3 && n != 5) {
av_log(NULL, AV_LOG_FATAL, "Syntax error, mapchan usage: "
"[file.stream.channel|-1][:syncfile:syncstream]\n");
exit_program(1);
}
if (n != 5) // only file.stream.channel specified
m->ofile_idx = m->ostream_idx = -1;
/* check input */
if (m->file_idx < 0 || m->file_idx >= nb_input_files) {
av_log(NULL, AV_LOG_FATAL, "mapchan: invalid input file index: %d\n",
m->file_idx);
exit_program(1);
}
if (m->stream_idx < 0 ||
m->stream_idx >= input_files[m->file_idx]->nb_streams) {
av_log(NULL, AV_LOG_FATAL, "mapchan: invalid input file stream index #%d.%d\n",
m->file_idx, m->stream_idx);
exit_program(1);
}
st = input_files[m->file_idx]->ctx->streams[m->stream_idx];
if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
av_log(NULL, AV_LOG_FATAL, "mapchan: stream #%d.%d is not an audio stream.\n",
m->file_idx, m->stream_idx);
exit_program(1);
}
if (m->channel_idx < 0 || m->channel_idx >= st->codec->channels) {
av_log(NULL, AV_LOG_FATAL, "mapchan: invalid audio channel #%d.%d.%d\n",
m->file_idx, m->stream_idx, m->channel_idx);
exit_program(1);
}
return 0;
}
/**
* Parse a metadata specifier passed as 'arg' parameter.
* @param arg metadata string to parse
* @param type metadata type is written here -- g(lobal)/s(tream)/c(hapter)/p(rogram)
* @param index for type c/p, chapter/program index is written here
* @param stream_spec for type s, the stream specifier is written here
*/
static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
{
if (*arg) {
*type = *arg;
switch (*arg) {
case 'g':
break;
case 's':
if (*(++arg) && *arg != ':') {
av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\n", arg);
exit_program(1);
}
*stream_spec = *arg == ':' ? arg + 1 : "";
break;
case 'c':
case 'p':
if (*(++arg) == ':')
*index = strtol(++arg, NULL, 0);
break;
default:
av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
exit_program(1);
}
} else
*type = 'g';
}
static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)
{
AVDictionary **meta_in = NULL;
AVDictionary **meta_out = NULL;
int i, ret = 0;
char type_in, type_out;
const char *istream_spec = NULL, *ostream_spec = NULL;
int idx_in = 0, idx_out = 0;
parse_meta_type(inspec, &type_in, &idx_in, &istream_spec);
parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
if (!ic) {
if (type_out == 'g' || !*outspec)
o->metadata_global_manual = 1;
if (type_out == 's' || !*outspec)
o->metadata_streams_manual = 1;
if (type_out == 'c' || !*outspec)
o->metadata_chapters_manual = 1;
return 0;
}
if (type_in == 'g' || type_out == 'g')
o->metadata_global_manual = 1;
if (type_in == 's' || type_out == 's')
o->metadata_streams_manual = 1;
if (type_in == 'c' || type_out == 'c')
o->metadata_chapters_manual = 1;
/* ic is NULL when just disabling automatic mappings */
if (!ic)
return 0;
#define METADATA_CHECK_INDEX(index, nb_elems, desc)\
if ((index) < 0 || (index) >= (nb_elems)) {\
av_log(NULL, AV_LOG_FATAL, "Invalid %s index %d while processing metadata maps.\n",\
(desc), (index));\
exit_program(1);\
}
#define SET_DICT(type, meta, context, index)\
switch (type) {\
case 'g':\
meta = &context->metadata;\
break;\
case 'c':\
METADATA_CHECK_INDEX(index, context->nb_chapters, "chapter")\
meta = &context->chapters[index]->metadata;\
break;\
case 'p':\
METADATA_CHECK_INDEX(index, context->nb_programs, "program")\
meta = &context->programs[index]->metadata;\
break;\
case 's':\
break; /* handled separately below */ \
default: av_assert0(0);\
}\
SET_DICT(type_in, meta_in, ic, idx_in);
SET_DICT(type_out, meta_out, oc, idx_out);
/* for input streams choose first matching stream */
if (type_in == 's') {
for (i = 0; i < ic->nb_streams; i++) {
if ((ret = check_stream_specifier(ic, ic->streams[i], istream_spec)) > 0) {
meta_in = &ic->streams[i]->metadata;
break;
} else if (ret < 0)
exit_program(1);
}
if (!meta_in) {
av_log(NULL, AV_LOG_FATAL, "Stream specifier %s does not match any streams.\n", istream_spec);
exit_program(1);
}
}
if (type_out == 's') {
for (i = 0; i < oc->nb_streams; i++) {
if ((ret = check_stream_specifier(oc, oc->streams[i], ostream_spec)) > 0) {
meta_out = &oc->streams[i]->metadata;
av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
} else if (ret < 0)
exit_program(1);
}
} else
av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
return 0;
}
static int opt_recording_timestamp(void *optctx, const char *opt, const char *arg)
{
OptionsContext *o = optctx;
char buf[128];
int64_t recording_timestamp = parse_time_or_die(opt, arg, 0) / 1E6;
struct tm time = *gmtime((time_t*)&recording_timestamp);
if (!strftime(buf, sizeof(buf), "creation_time=%FT%T%z", &time))
return -1;
parse_option(o, "metadata", buf, options);
av_log(NULL, AV_LOG_WARNING, "%s is deprecated, set the 'creation_time' metadata "
"tag instead.\n", opt);
return 0;
}
static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
{
const AVCodecDescriptor *desc;
const char *codec_string = encoder ? "encoder" : "decoder";
AVCodec *codec;
codec = encoder ?
avcodec_find_encoder_by_name(name) :
avcodec_find_decoder_by_name(name);
if (!codec && (desc = avcodec_descriptor_get_by_name(name))) {
codec = encoder ? avcodec_find_encoder(desc->id) :
avcodec_find_decoder(desc->id);
if (codec)
av_log(NULL, AV_LOG_VERBOSE, "Matched %s '%s' for codec '%s'.\n",
codec_string, codec->name, desc->name);
}
if (!codec) {
av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
exit_program(1);
}
if (codec->type != type) {
av_log(NULL, AV_LOG_FATAL, "Invalid %s type '%s'\n", codec_string, name);
exit_program(1);
}
return codec;
}
static AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVStream *st)
{
char *codec_name = NULL;
MATCH_PER_STREAM_OPT(codec_names, str, codec_name, s, st);
if (codec_name) {
AVCodec *codec = find_codec_or_die(codec_name, st->codec->codec_type, 0);
st->codec->codec_id = codec->id;
return codec;
} else
return avcodec_find_decoder(st->codec->codec_id);
}
/* Add all the streams from the given input file to the global
* list of input streams. */
static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
{
int i, ret;
for (i = 0; i < ic->nb_streams; i++) {
AVStream *st = ic->streams[i];
AVCodecContext *dec = st->codec;
InputStream *ist = av_mallocz(sizeof(*ist));
char *framerate = NULL, *hwaccel = NULL, *hwaccel_device = NULL;
char *codec_tag = NULL;
char *next;
char *discard_str = NULL;
const AVOption *discard_opt = av_opt_find(dec, "skip_frame", NULL, 0, 0);
if (!ist)
exit_program(1);
GROW_ARRAY(input_streams, nb_input_streams);
input_streams[nb_input_streams - 1] = ist;
ist->st = st;
ist->file_index = nb_input_files;
ist->discard = 1;
st->discard = AVDISCARD_ALL;
ist->ts_scale = 1.0;
MATCH_PER_STREAM_OPT(ts_scale, dbl, ist->ts_scale, ic, st);
MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, ic, st);
if (codec_tag) {
uint32_t tag = strtol(codec_tag, &next, 0);
if (*next)
tag = AV_RL32(codec_tag);
st->codec->codec_tag = tag;
}
ist->dec = choose_decoder(o, ic, st);
ist->decoder_opts = filter_codec_opts(o->g->codec_opts, ist->st->codec->codec_id, ic, st, ist->dec);
ist->reinit_filters = -1;
MATCH_PER_STREAM_OPT(reinit_filters, i, ist->reinit_filters, ic, st);
MATCH_PER_STREAM_OPT(discard, str, discard_str, ic, st);
ist->user_set_discard = AVDISCARD_NONE;
if (discard_str && av_opt_eval_int(dec, discard_opt, discard_str, &ist->user_set_discard) < 0) {
av_log(NULL, AV_LOG_ERROR, "Error parsing discard %s.\n",
discard_str);
exit_program(1);
}
ist->filter_in_rescale_delta_last = AV_NOPTS_VALUE;
ist->dec_ctx = avcodec_alloc_context3(ist->dec);
if (!ist->dec_ctx) {
av_log(NULL, AV_LOG_ERROR, "Error allocating the decoder context.\n");
exit_program(1);
}
ret = avcodec_copy_context(ist->dec_ctx, dec);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error initializing the decoder context.\n");
exit_program(1);
}
switch (dec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if(!ist->dec)
ist->dec = avcodec_find_decoder(dec->codec_id);
if (av_codec_get_lowres(dec)) {
dec->flags |= CODEC_FLAG_EMU_EDGE;
}
ist->resample_height = ist->dec_ctx->height;
ist->resample_width = ist->dec_ctx->width;
ist->resample_pix_fmt = ist->dec_ctx->pix_fmt;
MATCH_PER_STREAM_OPT(frame_rates, str, framerate, ic, st);
if (framerate && av_parse_video_rate(&ist->framerate,
framerate) < 0) {
av_log(NULL, AV_LOG_ERROR, "Error parsing framerate %s.\n",
framerate);
exit_program(1);
}
ist->top_field_first = -1;
MATCH_PER_STREAM_OPT(top_field_first, i, ist->top_field_first, ic, st);
MATCH_PER_STREAM_OPT(hwaccels, str, hwaccel, ic, st);
if (hwaccel) {
if (!strcmp(hwaccel, "none"))
ist->hwaccel_id = HWACCEL_NONE;
else if (!strcmp(hwaccel, "auto"))
ist->hwaccel_id = HWACCEL_AUTO;
else {
int i;
for (i = 0; hwaccels[i].name; i++) {
if (!strcmp(hwaccels[i].name, hwaccel)) {
ist->hwaccel_id = hwaccels[i].id;
break;
}
}
if (!ist->hwaccel_id) {
av_log(NULL, AV_LOG_FATAL, "Unrecognized hwaccel: %s.\n",
hwaccel);
av_log(NULL, AV_LOG_FATAL, "Supported hwaccels: ");
for (i = 0; hwaccels[i].name; i++)
av_log(NULL, AV_LOG_FATAL, "%s ", hwaccels[i].name);
av_log(NULL, AV_LOG_FATAL, "\n");
exit_program(1);
}
}
}
MATCH_PER_STREAM_OPT(hwaccel_devices, str, hwaccel_device, ic, st);
if (hwaccel_device) {
ist->hwaccel_device = av_strdup(hwaccel_device);
if (!ist->hwaccel_device)
exit_program(1);
}
ist->hwaccel_pix_fmt = AV_PIX_FMT_NONE;
break;
case AVMEDIA_TYPE_AUDIO:
ist->guess_layout_max = INT_MAX;
MATCH_PER_STREAM_OPT(guess_layout_max, i, ist->guess_layout_max, ic, st);
guess_input_channel_layout(ist);
ist->resample_sample_fmt = ist->dec_ctx->sample_fmt;
ist->resample_sample_rate = ist->dec_ctx->sample_rate;
ist->resample_channels = ist->dec_ctx->channels;
ist->resample_channel_layout = ist->dec_ctx->channel_layout;
break;
case AVMEDIA_TYPE_DATA:
case AVMEDIA_TYPE_SUBTITLE: {
char *canvas_size = NULL;
if(!ist->dec)
ist->dec = avcodec_find_decoder(dec->codec_id);
MATCH_PER_STREAM_OPT(fix_sub_duration, i, ist->fix_sub_duration, ic, st);
MATCH_PER_STREAM_OPT(canvas_sizes, str, canvas_size, ic, st);
if (canvas_size &&
av_parse_video_size(&ist->dec_ctx->width, &ist->dec_ctx->height, canvas_size) < 0) {
av_log(NULL, AV_LOG_FATAL, "Invalid canvas size: %s.\n", canvas_size);
exit_program(1);
}
break;
}
case AVMEDIA_TYPE_ATTACHMENT:
case AVMEDIA_TYPE_UNKNOWN:
break;
default:
abort();
}
}
}
static void assert_file_overwrite(const char *filename)
{
if (file_overwrite && no_file_overwrite) {
fprintf(stderr, "Error, both -y and -n supplied. Exiting.\n");
exit_program(1);
}
if (!file_overwrite) {
const char *proto_name = avio_find_protocol_name(filename);
if (proto_name && !strcmp(proto_name, "file") && avio_check(filename, 0) == 0) {
if (stdin_interaction && !no_file_overwrite) {
fprintf(stderr,"File '%s' already exists. Overwrite ? [y/N] ", filename);
fflush(stderr);
term_exit();
signal(SIGINT, SIG_DFL);
if (!read_yesno()) {
av_log(NULL, AV_LOG_FATAL, "Not overwriting - exiting\n");
exit_program(1);
}
term_init();
}
else {
av_log(NULL, AV_LOG_FATAL, "File '%s' already exists. Exiting.\n", filename);
exit_program(1);
}
}
}
}
static void dump_attachment(AVStream *st, const char *filename)
{
int ret;
AVIOContext *out = NULL;
AVDictionaryEntry *e;
if (!st->codec->extradata_size) {
av_log(NULL, AV_LOG_WARNING, "No extradata to dump in stream #%d:%d.\n",
nb_input_files - 1, st->index);
return;
}
if (!*filename && (e = av_dict_get(st->metadata, "filename", NULL, 0)))
filename = e->value;
if (!*filename) {
av_log(NULL, AV_LOG_FATAL, "No filename specified and no 'filename' tag"
"in stream #%d:%d.\n", nb_input_files - 1, st->index);
exit_program(1);
}
assert_file_overwrite(filename);
if ((ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, &int_cb, NULL)) < 0) {
av_log(NULL, AV_LOG_FATAL, "Could not open file %s for writing.\n",
filename);
exit_program(1);
}
avio_write(out, st->codec->extradata, st->codec->extradata_size);
avio_flush(out);
avio_close(out);
}
static int open_input_file(OptionsContext *o, const char *filename)
{
InputFile *f;
AVFormatContext *ic;
AVInputFormat *file_iformat = NULL;
int err, i, ret;
int64_t timestamp;
AVDictionary **opts;
AVDictionary *unused_opts = NULL;
AVDictionaryEntry *e = NULL;
int orig_nb_streams; // number of streams before avformat_find_stream_info
char * video_codec_name = NULL;
char * audio_codec_name = NULL;
char *subtitle_codec_name = NULL;
if (o->format) {
if (!(file_iformat = av_find_input_format(o->format))) {
av_log(NULL, AV_LOG_FATAL, "Unknown input format: '%s'\n", o->format);
exit_program(1);
}
}
if (!strcmp(filename, "-"))
filename = "pipe:";
stdin_interaction &= strncmp(filename, "pipe:", 5) &&
strcmp(filename, "/dev/stdin");
/* get default parameters from command line */
ic = avformat_alloc_context();
if (!ic) {
print_error(filename, AVERROR(ENOMEM));
exit_program(1);
}
if (o->nb_audio_sample_rate) {
av_dict_set_int(&o->g->format_opts, "sample_rate", o->audio_sample_rate[o->nb_audio_sample_rate - 1].u.i, 0);
}
if (o->nb_audio_channels) {
/* because we set audio_channels based on both the "ac" and
* "channel_layout" options, we need to check that the specified
* demuxer actually has the "channels" option before setting it */
if (file_iformat && file_iformat->priv_class &&
av_opt_find(&file_iformat->priv_class, "channels", NULL, 0,
AV_OPT_SEARCH_FAKE_OBJ)) {
av_dict_set_int(&o->g->format_opts, "channels", o->audio_channels[o->nb_audio_channels - 1].u.i, 0);
}
}
if (o->nb_frame_rates) {
/* set the format-level framerate option;
* this is important for video grabbers, e.g. x11 */
if (file_iformat && file_iformat->priv_class &&
av_opt_find(&file_iformat->priv_class, "framerate", NULL, 0,
AV_OPT_SEARCH_FAKE_OBJ)) {
av_dict_set(&o->g->format_opts, "framerate",
o->frame_rates[o->nb_frame_rates - 1].u.str, 0);
}
}
if (o->nb_frame_sizes) {
av_dict_set(&o->g->format_opts, "video_size", o->frame_sizes[o->nb_frame_sizes - 1].u.str, 0);
}
if (o->nb_frame_pix_fmts)
av_dict_set(&o->g->format_opts, "pixel_format", o->frame_pix_fmts[o->nb_frame_pix_fmts - 1].u.str, 0);
MATCH_PER_TYPE_OPT(codec_names, str, video_codec_name, ic, "v");
MATCH_PER_TYPE_OPT(codec_names, str, audio_codec_name, ic, "a");
MATCH_PER_TYPE_OPT(codec_names, str, subtitle_codec_name, ic, "s");
ic->video_codec_id = video_codec_name ?
find_codec_or_die(video_codec_name , AVMEDIA_TYPE_VIDEO , 0)->id : AV_CODEC_ID_NONE;
ic->audio_codec_id = audio_codec_name ?
find_codec_or_die(audio_codec_name , AVMEDIA_TYPE_AUDIO , 0)->id : AV_CODEC_ID_NONE;
ic->subtitle_codec_id= subtitle_codec_name ?
find_codec_or_die(subtitle_codec_name, AVMEDIA_TYPE_SUBTITLE, 0)->id : AV_CODEC_ID_NONE;
if (video_codec_name)
av_format_set_video_codec (ic, find_codec_or_die(video_codec_name , AVMEDIA_TYPE_VIDEO , 0));
if (audio_codec_name)
av_format_set_audio_codec (ic, find_codec_or_die(audio_codec_name , AVMEDIA_TYPE_AUDIO , 0));
if (subtitle_codec_name)
av_format_set_subtitle_codec(ic, find_codec_or_die(subtitle_codec_name, AVMEDIA_TYPE_SUBTITLE, 0));
ic->flags |= AVFMT_FLAG_NONBLOCK;
ic->interrupt_callback = int_cb;
/* open the input file with generic avformat function */
err = avformat_open_input(&ic, filename, file_iformat, &o->g->format_opts);
if (err < 0) {
print_error(filename, err);
exit_program(1);
}
remove_avoptions(&o->g->format_opts, o->g->codec_opts);
assert_avoptions(o->g->format_opts);
/* apply forced codec ids */
for (i = 0; i < ic->nb_streams; i++)
choose_decoder(o, ic, ic->streams[i]);
/* Set AVCodecContext options for avformat_find_stream_info */
opts = setup_find_stream_info_opts(ic, o->g->codec_opts);
orig_nb_streams = ic->nb_streams;
/* If not enough info to get the stream parameters, we decode the
first frames to get it. (used in mpeg case for example) */
ret = avformat_find_stream_info(ic, opts);
if (ret < 0) {
av_log(NULL, AV_LOG_FATAL, "%s: could not find codec parameters\n", filename);
if (ic->nb_streams == 0) {
avformat_close_input(&ic);
exit_program(1);
}
}
timestamp = (o->start_time == AV_NOPTS_VALUE) ? 0 : o->start_time;
/* add the stream start time */
if (ic->start_time != AV_NOPTS_VALUE)
timestamp += ic->start_time;
/* if seeking requested, we execute it */
if (o->start_time != AV_NOPTS_VALUE) {
ret = avformat_seek_file(ic, -1, INT64_MIN, timestamp, timestamp, 0);
if (ret < 0) {
av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f\n",
filename, (double)timestamp / AV_TIME_BASE);
}
}
/* update the current parameters so that they match the one of the input stream */
add_input_streams(o, ic);
/* dump the file content */
av_dump_format(ic, nb_input_files, filename, 0);
GROW_ARRAY(input_files, nb_input_files);
f = av_mallocz(sizeof(*f));
if (!f)
exit_program(1);
input_files[nb_input_files - 1] = f;
f->ctx = ic;
f->ist_index = nb_input_streams - ic->nb_streams;
f->start_time = o->start_time;
f->recording_time = o->recording_time;
f->input_ts_offset = o->input_ts_offset;
f->ts_offset = o->input_ts_offset - (copy_ts ? (start_at_zero && ic->start_time != AV_NOPTS_VALUE ? ic->start_time : 0) : timestamp);
f->nb_streams = ic->nb_streams;
f->rate_emu = o->rate_emu;
f->accurate_seek = o->accurate_seek;
/* check if all codec options have been used */
unused_opts = strip_specifiers(o->g->codec_opts);
for (i = f->ist_index; i < nb_input_streams; i++) {
e = NULL;
while ((e = av_dict_get(input_streams[i]->decoder_opts, "", e,
AV_DICT_IGNORE_SUFFIX)))
av_dict_set(&unused_opts, e->key, NULL, 0);
}
e = NULL;
while ((e = av_dict_get(unused_opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
const AVClass *class = avcodec_get_class();
const AVOption *option = av_opt_find(&class, e->key, NULL, 0,
AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);
const AVClass *fclass = avformat_get_class();
const AVOption *foption = av_opt_find(&fclass, e->key, NULL, 0,
AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);
if (!option || foption)
continue;
if (!(option->flags & AV_OPT_FLAG_DECODING_PARAM)) {
av_log(NULL, AV_LOG_ERROR, "Codec AVOption %s (%s) specified for "
"input file #%d (%s) is not a decoding option.\n", e->key,
option->help ? option->help : "", nb_input_files - 1,
filename);
exit_program(1);
}
av_log(NULL, AV_LOG_WARNING, "Codec AVOption %s (%s) specified for "
"input file #%d (%s) has not been used for any stream. The most "
"likely reason is either wrong type (e.g. a video option with "
"no video streams) or that it is a private option of some decoder "
"which was not actually used for any stream.\n", e->key,
option->help ? option->help : "", nb_input_files - 1, filename);
}
av_dict_free(&unused_opts);
for (i = 0; i < o->nb_dump_attachment; i++) {
int j;
for (j = 0; j < ic->nb_streams; j++) {
AVStream *st = ic->streams[j];
if (check_stream_specifier(ic, st, o->dump_attachment[i].specifier) == 1)
dump_attachment(st, o->dump_attachment[i].u.str);
}
}
for (i = 0; i < orig_nb_streams; i++)
av_dict_free(&opts[i]);
av_freep(&opts);
return 0;
}
static uint8_t *get_line(AVIOContext *s)
{
AVIOContext *line;
uint8_t *buf;
char c;
if (avio_open_dyn_buf(&line) < 0) {
av_log(NULL, AV_LOG_FATAL, "Could not alloc buffer for reading preset.\n");
exit_program(1);
}
while ((c = avio_r8(s)) && c != '\n')
avio_w8(line, c);
avio_w8(line, 0);