/*

* ffmpeg filter configuration

*

* 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 "libavfilter/avfilter.h"

#include "libavfilter/buffersink.h"

#include "libavresample/avresample.h"

#include "libavutil/avassert.h"

#include "libavutil/avstring.h"

#include "libavutil/bprint.h"

#include "libavutil/channel_layout.h"

#include "libavutil/display.h"

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "libavutil/pixfmt.h"

#include "libavutil/imgutils.h"

#include "libavutil/samplefmt.h"

enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)

{

if (codec && codec->pix_fmts) {

const enum AVPixelFormat *p = codec->pix_fmts;

const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);

int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;

enum AVPixelFormat best= AV_PIX_FMT_NONE;

static const enum AVPixelFormat mjpeg_formats[] =

{ AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };

static const enum AVPixelFormat ljpeg_formats[] =

{ AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,

AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };

if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {

if (enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {

p = mjpeg_formats;

} else if (enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {

p =ljpeg_formats;

}

}

for (; *p != AV_PIX_FMT_NONE; p++) {

best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);

if (*p == target)

break;

}

if (*p == AV_PIX_FMT_NONE) {

if (target != AV_PIX_FMT_NONE)

av_log(NULL, AV_LOG_WARNING,

"Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",

av_get_pix_fmt_name(target),

codec->name,

av_get_pix_fmt_name(best));

return best;

}

}

return target;

}

void choose_sample_fmt(AVStream *st, AVCodec *codec)

{

if (codec && codec->sample_fmts) {

const enum AVSampleFormat *p = codec->sample_fmts;

for (; *p != -1; p++) {

if (*p == st->codec->sample_fmt)

break;

}

if (*p == -1) {

if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))

av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");

if(av_get_sample_fmt_name(st->codec->sample_fmt))

av_log(NULL, AV_LOG_WARNING,

"Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",

av_get_sample_fmt_name(st->codec->sample_fmt),

codec->name,

av_get_sample_fmt_name(codec->sample_fmts[0]));

st->codec->sample_fmt = codec->sample_fmts[0];

}

}

}

static char *choose_pix_fmts(OutputStream *ost)

{

AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);

if (strict_dict)

// used by choose_pixel_fmt() and below

av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);

if (ost->keep_pix_fmt) {

if (ost->filter)

avfilter_graph_set_auto_convert(ost->filter->graph->graph,

AVFILTER_AUTO_CONVERT_NONE);

if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)

return NULL;

return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));

}

if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {

return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));

} else if (ost->enc && ost->enc->pix_fmts) {

const enum AVPixelFormat *p;

AVIOContext *s = NULL;

uint8_t *ret;

int len;

if (avio_open_dyn_buf(&s) < 0)

exit_program(1);

p = ost->enc->pix_fmts;

if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {

if (ost->enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {

p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };

} else if (ost->enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {

p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,

AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };

}

}

for (; *p != AV_PIX_FMT_NONE; p++) {

const char *name = av_get_pix_fmt_name(*p);

avio_printf(s, "%s|", name);

}

len = avio_close_dyn_buf(s, &ret);

ret[len - 1] = 0;

return ret;

} else

return NULL;

}

/* Define a function for building a string containing a list of

* allowed formats. */

#define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name) \

static char *choose_ ## var ## s(OutputStream *ost) \

{ \

if (ost->enc_ctx->var != none) { \

get_name(ost->enc_ctx->var); \

return av_strdup(name); \

} else if (ost->enc && ost->enc->supported_list) { \

const type *p; \

AVIOContext *s = NULL; \

uint8_t *ret; \

int len; \

\

if (avio_open_dyn_buf(&s) < 0) \

exit_program(1); \

\

for (p = ost->enc->supported_list; *p != none; p++) { \

get_name(*p); \

avio_printf(s, "%s|", name); \

} \

len = avio_close_dyn_buf(s, &ret); \

ret[len - 1] = 0; \

return ret; \

} else \

return NULL; \

}

// DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,

// GET_PIX_FMT_NAME)

DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,

AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)

DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,

GET_SAMPLE_RATE_NAME)

DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,

GET_CH_LAYOUT_NAME)

FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)

{

FilterGraph *fg = av_mallocz(sizeof(*fg));

if (!fg)

exit_program(1);

fg->index = nb_filtergraphs;

GROW_ARRAY(fg->outputs, fg->nb_outputs);

if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))

exit_program(1);

fg->outputs[0]->ost = ost;

fg->outputs[0]->graph = fg;

ost->filter = fg->outputs[0];

GROW_ARRAY(fg->inputs, fg->nb_inputs);

if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))

exit_program(1);

fg->inputs[0]->ist = ist;

fg->inputs[0]->graph = fg;

GROW_ARRAY(ist->filters, ist->nb_filters);

ist->filters[ist->nb_filters - 1] = fg->inputs[0];

GROW_ARRAY(filtergraphs, nb_filtergraphs);

filtergraphs[nb_filtergraphs - 1] = fg;

return fg;

}

static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)

{

InputStream *ist = NULL;

enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);

int i;

// TODO: support other filter types

if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {

av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "

"currently.\n");

exit_program(1);

}

if (in->name) {

AVFormatContext *s;

AVStream *st = NULL;

char *p;

int file_idx = strtol(in->name, &p, 0);

if (file_idx < 0 || file_idx >= nb_input_files) {

av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",

file_idx, fg->graph_desc);

exit_program(1);

}

s = input_files[file_idx]->ctx;

for (i = 0; i < s->nb_streams; i++) {

enum AVMediaType stream_type = s->streams[i]->codec->codec_type;

if (stream_type != type &&

!(stream_type == AVMEDIA_TYPE_SUBTITLE &&

type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))

continue;

if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {

st = s->streams[i];

break;

}

}

if (!st) {

av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "

"matches no streams.\n", p, fg->graph_desc);

exit_program(1);

}

ist = input_streams[input_files[file_idx]->ist_index + st->index];

} else {

/* find the first unused stream of corresponding type */

for (i = 0; i < nb_input_streams; i++) {

ist = input_streams[i];

if (ist->dec_ctx->codec_type == type && ist->discard)

break;

}

if (i == nb_input_streams) {

av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "

"unlabeled input pad %d on filter %s\n", in->pad_idx,

in->filter_ctx->name);

exit_program(1);

}

}

av_assert0(ist);

ist->discard = 0;

ist->decoding_needed |= DECODING_FOR_FILTER;

ist->st->discard = AVDISCARD_NONE;

GROW_ARRAY(fg->inputs, fg->nb_inputs);

if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))

exit_program(1);

fg->inputs[fg->nb_inputs - 1]->ist = ist;

fg->inputs[fg->nb_inputs - 1]->graph = fg;

GROW_ARRAY(ist->filters, ist->nb_filters);

ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];

}

int init_complex_filtergraph(FilterGraph *fg)

{

AVFilterInOut *inputs, *outputs, *cur;

AVFilterGraph *graph;

int ret = 0;

/* this graph is only used for determining the kinds of inputs

* and outputs we have, and is discarded on exit from this function */

graph = avfilter_graph_alloc();

if (!graph)

return AVERROR(ENOMEM);

ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);

if (ret < 0)

goto fail;

for (cur = inputs; cur; cur = cur->next)

init_input_filter(fg, cur);

for (cur = outputs; cur;) {

GROW_ARRAY(fg->outputs, fg->nb_outputs);

fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));

if (!fg->outputs[fg->nb_outputs - 1])

exit_program(1);

fg->outputs[fg->nb_outputs - 1]->graph = fg;

fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;

fg->outputs[fg->nb_outputs - 1]->type = avfilter_pad_get_type(cur->filter_ctx->output_pads,

cur->pad_idx);

cur = cur->next;

fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;

}

fail:

avfilter_inout_free(&inputs);

avfilter_graph_free(&graph);

return ret;

}

static int insert_trim(int64_t start_time, int64_t duration,

AVFilterContext **last_filter, int *pad_idx,

const char *filter_name)

{

AVFilterGraph *graph = (*last_filter)->graph;

AVFilterContext *ctx;

const AVFilter *trim;

enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);

const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";

int ret = 0;

if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)

return 0;

trim = avfilter_get_by_name(name);

if (!trim) {

av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "

"recording time.\n", name);

return AVERROR_FILTER_NOT_FOUND;

}

ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);

if (!ctx)

return AVERROR(ENOMEM);

if (duration != INT64_MAX) {

ret = av_opt_set_int(ctx, "durationi", duration,

AV_OPT_SEARCH_CHILDREN);

}

if (ret >= 0 && start_time != AV_NOPTS_VALUE) {

ret = av_opt_set_int(ctx, "starti", start_time,

AV_OPT_SEARCH_CHILDREN);

}

if (ret < 0) {

av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);

return ret;

}

ret = avfilter_init_str(ctx, NULL);

if (ret < 0)

return ret;

ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);

if (ret < 0)

return ret;

*last_filter = ctx;

*pad_idx = 0;

return 0;

}

static int insert_filter(AVFilterContext **last_filter, int *pad_idx,

const char *filter_name, const char *args)

{

AVFilterGraph *graph = (*last_filter)->graph;

AVFilterContext *ctx;

int ret;

ret = avfilter_graph_create_filter(&ctx,

avfilter_get_by_name(filter_name),

filter_name, args, NULL, graph);

if (ret < 0)

return ret;

ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);

if (ret < 0)

return ret;

*last_filter = ctx;

*pad_idx = 0;

return 0;

}

static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)

{

char *pix_fmts;

OutputStream *ost = ofilter->ost;

OutputFile *of = output_files[ost->file_index];

AVCodecContext *codec = ost->enc_ctx;

AVFilterContext *last_filter = out->filter_ctx;

int pad_idx = out->pad_idx;

int ret;

char name[255];

snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);

ret = avfilter_graph_create_filter(&ofilter->filter,

avfilter_get_by_name("buffersink"),

name, NULL, NULL, fg->graph);

if (ret < 0)

return ret;

if (codec->width || codec->height) {

char args[255];

AVFilterContext *filter;

AVDictionaryEntry *e = NULL;

snprintf(args, sizeof(args), "%d:%d",

codec->width,

codec->height);

while ((e = av_dict_get(ost->sws_dict, "", e,

AV_DICT_IGNORE_SUFFIX))) {

av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);

}

snprintf(name, sizeof(name), "scaler for output stream %d:%d",

ost->file_index, ost->index);

if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),

name, args, NULL, fg->graph)) < 0)

return ret;

if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)

return ret;

last_filter = filter;

pad_idx = 0;

}

if ((pix_fmts = choose_pix_fmts(ost))) {

AVFilterContext *filter;

snprintf(name, sizeof(name), "pixel format for output stream %d:%d",

ost->file_index, ost->index);

ret = avfilter_graph_create_filter(&filter,

avfilter_get_by_name("format"),

"format", pix_fmts, NULL, fg->graph);

av_freep(&pix_fmts);

if (ret < 0)

return ret;

if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)

return ret;

last_filter = filter;

pad_idx = 0;

}

if (ost->frame_rate.num && 0) {

AVFilterContext *fps;

char args[255];

snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,

ost->frame_rate.den);

snprintf(name, sizeof(name), "fps for output stream %d:%d",

ost->file_index, ost->index);

ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),

name, args, NULL, fg->graph);

if (ret < 0)

return ret;

ret = avfilter_link(last_filter, pad_idx, fps, 0);

if (ret < 0)

return ret;

last_filter = fps;

pad_idx = 0;

}

snprintf(name, sizeof(name), "trim for output stream %d:%d",

ost->file_index, ost->index);

ret = insert_trim(of->start_time, of->recording_time,

&last_filter, &pad_idx, name);

if (ret < 0)

return ret;

if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)

return ret;

return 0;

}

static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)

{

OutputStream *ost = ofilter->ost;

OutputFile *of = output_files[ost->file_index];

AVCodecContext *codec = ost->enc_ctx;

AVFilterContext *last_filter = out->filter_ctx;

int pad_idx = out->pad_idx;

char *sample_fmts, *sample_rates, *channel_layouts;

char name[255];

int ret;

snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);

ret = avfilter_graph_create_filter(&ofilter->filter,

avfilter_get_by_name("abuffersink"),

name, NULL, NULL, fg->graph);

if (ret < 0)

return ret;

if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)

return ret;

#define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \

AVFilterContext *filt_ctx; \

\

av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \

"similarly to -af " filter_name "=%s.\n", arg); \

\

ret = avfilter_graph_create_filter(&filt_ctx, \

avfilter_get_by_name(filter_name), \

filter_name, arg, NULL, fg->graph); \

if (ret < 0) \

return ret; \

\

ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \

if (ret < 0) \

return ret; \

\

last_filter = filt_ctx; \

pad_idx = 0; \

} while (0)

if (ost->audio_channels_mapped) {

int i;

AVBPrint pan_buf;

av_bprint_init(&pan_buf, 256, 8192);

av_bprintf(&pan_buf, "0x%"PRIx64,

av_get_default_channel_layout(ost->audio_channels_mapped));

for (i = 0; i < ost->audio_channels_mapped; i++)

if (ost->audio_channels_map[i] != -1)

av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);

AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);

av_bprint_finalize(&pan_buf, NULL);

}

if (codec->channels && !codec->channel_layout)

codec->channel_layout = av_get_default_channel_layout(codec->channels);

sample_fmts = choose_sample_fmts(ost);

sample_rates = choose_sample_rates(ost);

channel_layouts = choose_channel_layouts(ost);

if (sample_fmts || sample_rates || channel_layouts) {

AVFilterContext *format;

char args[256];

args[0] = 0;

if (sample_fmts)

av_strlcatf(args, sizeof(args), "sample_fmts=%s:",

sample_fmts);

if (sample_rates)

av_strlcatf(args, sizeof(args), "sample_rates=%s:",

sample_rates);

if (channel_layouts)

av_strlcatf(args, sizeof(args), "channel_layouts=%s:",

channel_layouts);

av_freep(&sample_fmts);

av_freep(&sample_rates);

av_freep(&channel_layouts);

snprintf(name, sizeof(name), "audio format for output stream %d:%d",

ost->file_index, ost->index);

ret = avfilter_graph_create_filter(&format,

avfilter_get_by_name("aformat"),

name, args, NULL, fg->graph);

if (ret < 0)

return ret;

ret = avfilter_link(last_filter, pad_idx, format, 0);

if (ret < 0)

return ret;

last_filter = format;

pad_idx = 0;

}

if (audio_volume != 256 && 0) {

char args[256];

snprintf(args, sizeof(args), "%f", audio_volume / 256.);

AUTO_INSERT_FILTER("-vol", "volume", args);

}

if (ost->apad && of->shortest) {

char args[256];

int i;

for (i=0; i<of->ctx->nb_streams; i++)

if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)

break;

if (i<of->ctx->nb_streams) {

snprintf(args, sizeof(args), "%s", ost->apad);

AUTO_INSERT_FILTER("-apad", "apad", args);

}

}

snprintf(name, sizeof(name), "trim for output stream %d:%d",

ost->file_index, ost->index);

ret = insert_trim(of->start_time, of->recording_time,

&last_filter, &pad_idx, name);

if (ret < 0)

return ret;

if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)

return ret;

return 0;

}

#define DESCRIBE_FILTER_LINK(f, inout, in) \

{ \

AVFilterContext *ctx = inout->filter_ctx; \

AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \

int nb_pads = in ? ctx->nb_inputs : ctx->nb_outputs; \

AVIOContext *pb; \

\

if (avio_open_dyn_buf(&pb) < 0) \

exit_program(1); \

\

avio_printf(pb, "%s", ctx->filter->name); \

if (nb_pads > 1) \

avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\

avio_w8(pb, 0); \

avio_close_dyn_buf(pb, &f->name); \

}

int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)

{

av_freep(&ofilter->name);

DESCRIBE_FILTER_LINK(ofilter, out, 0);

if (!ofilter->ost) {

av_log(NULL, AV_LOG_FATAL, "Filter %s has a unconnected output\n", ofilter->name);

exit_program(1);

}

switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {

case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);

case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);

default: av_assert0(0);

}

}

static int sub2video_prepare(InputStream *ist)

{

AVFormatContext *avf = input_files[ist->file_index]->ctx;

int i, w, h;

/* Compute the size of the canvas for the subtitles stream.

If the subtitles codec has set a size, use it. Otherwise use the

maximum dimensions of the video streams in the same file. */

w = ist->dec_ctx->width;

h = ist->dec_ctx->height;

if (!(w && h)) {

for (i = 0; i < avf->nb_streams; i++) {

if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

w = FFMAX(w, avf->streams[i]->codec->width);

h = FFMAX(h, avf->streams[i]->codec->height);

}

}

if (!(w && h)) {

w = FFMAX(w, 720);

h = FFMAX(h, 576);

}

av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);

}

ist->sub2video.w = ist->dec_ctx->width = ist->resample_width = w;

ist->sub2video.h = ist->dec_ctx->height = ist->resample_height = h;

/* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the

palettes for all rectangles are identical or compatible */

ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;

ist->sub2video.frame = av_frame_alloc();

if (!ist->sub2video.frame)

return AVERROR(ENOMEM);

ist->sub2video.last_pts = INT64_MIN;

return 0;

}

static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,

AVFilterInOut *in)

{

AVFilterContext *last_filter;

const AVFilter *buffer_filt = avfilter_get_by_name("buffer");

InputStream *ist = ifilter->ist;

InputFile *f = input_files[ist->file_index];

AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :

ist->st->time_base;

AVRational fr = ist->framerate;

AVRational sar;

AVBPrint args;

char name[255];

int ret, pad_idx = 0;

int64_t tsoffset = 0;

if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {

av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");

return AVERROR(EINVAL);

}

if (!fr.num)

fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);

if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {

ret = sub2video_prepare(ist);

if (ret < 0)

return ret;

}

sar = ist->st->sample_aspect_ratio.num ?

ist->st->sample_aspect_ratio :

ist->dec_ctx->sample_aspect_ratio;

if(!sar.den)

sar = (AVRational){0,1};

av_bprint_init(&args, 0, 1);

av_bprintf(&args,

"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"

"pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,

ist->resample_height,

ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,

tb.num, tb.den, sar.num, sar.den,

SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));

if (fr.num && fr.den)

av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);

snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,

ist->file_index, ist->st->index);

if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,

args.str, NULL, fg->graph)) < 0)

return ret;

last_filter = ifilter->filter;

if (ist->autorotate) {

double theta = get_rotation(ist->st);

if (fabs(theta - 90) < 1.0) {

ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");

} else if (fabs(theta - 180) < 1.0) {

ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);

if (ret < 0)

return ret;

ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);

} else if (fabs(theta - 270) < 1.0) {

ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");

} else if (fabs(theta) > 1.0) {

char rotate_buf[64];

snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);

ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);

}

if (ret < 0)

return ret;

}

if (ist->framerate.num) {

AVFilterContext *setpts;

snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",

ist->file_index, ist->st->index);

if ((ret = avfilter_graph_create_filter(&setpts,

avfilter_get_by_name("setpts"),

name, "N", NULL,

fg->graph)) < 0)

return ret;

if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)

return ret;

last_filter = setpts;

}

if (do_deinterlace) {

AVFilterContext *yadif;

snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",

ist->file_index, ist->st->index);

if ((ret = avfilter_graph_create_filter(&yadif,

avfilter_get_by_name("yadif"),

name, "", NULL,

fg->graph)) < 0)

return ret;

if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)

return ret;

last_filter = yadif;

}

snprintf(name, sizeof(name), "trim for input stream %d:%d",

ist->file_index, ist->st->index);

if (copy_ts) {

tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;

if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)

tsoffset += f->ctx->start_time;

}

ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?

AV_NOPTS_VALUE : tsoffset, f->recording_time,

&last_filter, &pad_idx, name);

if (ret < 0)

return ret;

if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)

return ret;

return 0;

}

static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,

AVFilterInOut *in)

{

AVFilterContext *last_filter;

const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");

InputStream *ist = ifilter->ist;

InputFile *f = input_files[ist->file_index];

AVBPrint args;

char name[255];

int ret, pad_idx = 0;

int64_t tsoffset = 0;

if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {

av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");

return AVERROR(EINVAL);

}

av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);

av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",

1, ist->dec_ctx->sample_rate,

ist->dec_ctx->sample_rate,

av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));

if (ist->dec_ctx->channel_layout)

av_bprintf(&args, ":channel_layout=0x%"PRIx64,

ist->dec_ctx->channel_layout);

else

av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);

snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,

ist->file_index, ist->st->index);

if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,

name, args.str, NULL,

fg->graph)) < 0)

return ret;

last_filter = ifilter->filter;

#define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \

AVFilterContext *filt_ctx; \

\

av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \

"similarly to -af " filter_name "=%s.\n", arg); \

\

snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \

fg->index, filter_name, ist->file_index, ist->st->index); \

ret = avfilter_graph_create_filter(&filt_ctx, \

avfilter_get_by_name(filter_name), \

name, arg, NULL, fg->graph); \

if (ret < 0) \

return ret; \

\

ret = avfilter_link(last_filter, 0, filt_ctx, 0); \

if (ret < 0) \

return ret; \

\

last_filter = filt_ctx; \

} while (0)

if (audio_sync_method > 0) {

char args[256] = {0};

av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);

if (audio_drift_threshold != 0.1)

av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);

if (!fg->reconfiguration)

av_strlcatf(args, sizeof(args), ":first_pts=0");

AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);

}

// if (ost->audio_channels_mapped) {

// int i;

// AVBPrint pan_buf;

// av_bprint_init(&pan_buf, 256, 8192);

// av_bprintf(&pan_buf, "0x%"PRIx64,

// av_get_default_channel_layout(ost->audio_channels_mapped));

// for (i = 0; i < ost->audio_channels_mapped; i++)

// if (ost->audio_channels_map[i] != -1)

// av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);

// AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);

// av_bprint_finalize(&pan_buf, NULL);

// }

if (audio_volume != 256) {

char args[256];

av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "

"audio filter instead.\n");

snprintf(args, sizeof(args), "%f", audio_volume / 256.);

AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);

}

snprintf(name, sizeof(name), "trim for input stream %d:%d",

ist->file_index, ist->st->index);

if (copy_ts) {

tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;

if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)

tsoffset += f->ctx->start_time;

}

ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?

AV_NOPTS_VALUE : tsoffset, f->recording_time,

&last_filter, &pad_idx, name);

if (ret < 0)

return ret;

if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)

return ret;

return 0;

}

static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,

AVFilterInOut *in)

{

av_freep(&ifilter->name);

DESCRIBE_FILTER_LINK(ifilter, in, 1);

if (!ifilter->ist->dec) {

av_log(NULL, AV_LOG_ERROR,

"No decoder for stream #%d:%d, filtering impossible\n",

ifilter->ist->file_index, ifilter->ist->st->index);

return AVERROR_DECODER_NOT_FOUND;

}

switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {

case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);

case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);

default: av_assert0(0);

}

}

int configure_filtergraph(FilterGraph *fg)

{

AVFilterInOut *inputs, *outputs, *cur;

int ret, i, simple = !fg->graph_desc;

const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :

fg->graph_desc;

avfilter_graph_free(&fg->graph);

if (!(fg->graph = avfilter_graph_alloc()))

return AVERROR(ENOMEM);

if (simple) {

OutputStream *ost = fg->outputs[0]->ost;

char args[512];

AVDictionaryEntry *e = NULL;

args[0] = 0;

while ((e = av_dict_get(ost->sws_dict, "", e,

AV_DICT_IGNORE_SUFFIX))) {

av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);

}

if (strlen(args))

args[strlen(args)-1] = 0;

fg->graph->scale_sws_opts = av_strdup(args);

args[0] = 0;

while ((e = av_dict_get(ost->swr_opts, "", e,

AV_DICT_IGNORE_SUFFIX))) {

av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);

}

if (strlen(args))

args[strlen(args)-1] = 0;

av_opt_set(fg->graph, "aresample_swr_opts", args, 0);

args[0] = '\0';

while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,

AV_DICT_IGNORE_SUFFIX))) {

av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);

}

if (strlen(args))

args[strlen(args) - 1] = '\0';

fg->graph->resample_lavr_opts = av_strdup(args);

e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);

if (e)

av_opt_set(fg->graph, "threads", e->value, 0);

}