yading@10: /*
yading@10:  * ffmpeg filter configuration
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "ffmpeg.h"
yading@10: 
yading@10: #include "libavfilter/avfilter.h"
yading@10: #include "libavfilter/buffersink.h"
yading@10: 
yading@10: #include "libavresample/avresample.h"
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/bprint.h"
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/pixfmt.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/samplefmt.h"
yading@10: 
yading@10: enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
yading@10: {
yading@10:     if (codec && codec->pix_fmts) {
yading@10:         const enum AVPixelFormat *p = codec->pix_fmts;
yading@10:         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
yading@10:         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
yading@10:         enum AVPixelFormat best= AV_PIX_FMT_NONE;
yading@10:         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
yading@10:             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
yading@10:                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
yading@10:             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
yading@10:                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
yading@10:                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
yading@10:             }
yading@10:         }
yading@10:         for (; *p != AV_PIX_FMT_NONE; p++) {
yading@10:             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
yading@10:             if (*p == target)
yading@10:                 break;
yading@10:         }
yading@10:         if (*p == AV_PIX_FMT_NONE) {
yading@10:             if (target != AV_PIX_FMT_NONE)
yading@10:                 av_log(NULL, AV_LOG_WARNING,
yading@10:                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
yading@10:                        av_get_pix_fmt_name(target),
yading@10:                        codec->name,
yading@10:                        av_get_pix_fmt_name(best));
yading@10:             return best;
yading@10:         }
yading@10:     }
yading@10:     return target;
yading@10: }
yading@10: 
yading@10: void choose_sample_fmt(AVStream *st, AVCodec *codec)
yading@10: {
yading@10:     if (codec && codec->sample_fmts) {
yading@10:         const enum AVSampleFormat *p = codec->sample_fmts;
yading@10:         for (; *p != -1; p++) {
yading@10:             if (*p == st->codec->sample_fmt)
yading@10:                 break;
yading@10:         }
yading@10:         if (*p == -1) {
yading@10:             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
yading@10:                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
yading@10:             if(av_get_sample_fmt_name(st->codec->sample_fmt))
yading@10:             av_log(NULL, AV_LOG_WARNING,
yading@10:                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
yading@10:                    av_get_sample_fmt_name(st->codec->sample_fmt),
yading@10:                    codec->name,
yading@10:                    av_get_sample_fmt_name(codec->sample_fmts[0]));
yading@10:             st->codec->sample_fmt = codec->sample_fmts[0];
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static char *choose_pix_fmts(OutputStream *ost)
yading@10: {
yading@10:      if (ost->keep_pix_fmt) {
yading@10:         if (ost->filter)
yading@10:             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
yading@10:                                             AVFILTER_AUTO_CONVERT_NONE);
yading@10:         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
yading@10:             return NULL;
yading@10:         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
yading@10:     }
yading@10:     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
yading@10:         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
yading@10:     } else if (ost->enc && ost->enc->pix_fmts) {
yading@10:         const enum AVPixelFormat *p;
yading@10:         AVIOContext *s = NULL;
yading@10:         uint8_t *ret;
yading@10:         int len;
yading@10: 
yading@10:         if (avio_open_dyn_buf(&s) < 0)
yading@10:             exit(1);
yading@10: 
yading@10:         p = ost->enc->pix_fmts;
yading@10:         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
yading@10:             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
yading@10:                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
yading@10:             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
yading@10:                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
yading@10:                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         for (; *p != AV_PIX_FMT_NONE; p++) {
yading@10:             const char *name = av_get_pix_fmt_name(*p);
yading@10:             avio_printf(s, "%s|", name);
yading@10:         }
yading@10:         len = avio_close_dyn_buf(s, &ret);
yading@10:         ret[len - 1] = 0;
yading@10:         return ret;
yading@10:     } else
yading@10:         return NULL;
yading@10: }
yading@10: 
yading@10: /* Define a function for building a string containing a list of
yading@10:  * allowed formats. */
yading@10: #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
yading@10: static char *choose_ ## var ## s(OutputStream *ost)                            \
yading@10: {                                                                              \
yading@10:     if (ost->st->codec->var != none) {                                         \
yading@10:         get_name(ost->st->codec->var);                                         \
yading@10:         return av_strdup(name);                                                \
yading@10:     } else if (ost->enc && ost->enc->supported_list) {                         \
yading@10:         const type *p;                                                         \
yading@10:         AVIOContext *s = NULL;                                                 \
yading@10:         uint8_t *ret;                                                          \
yading@10:         int len;                                                               \
yading@10:                                                                                \
yading@10:         if (avio_open_dyn_buf(&s) < 0)                                         \
yading@10:             exit(1);                                                           \
yading@10:                                                                                \
yading@10:         for (p = ost->enc->supported_list; *p != none; p++) {                  \
yading@10:             get_name(*p);                                                      \
yading@10:             avio_printf(s, "%s|", name);                                       \
yading@10:         }                                                                      \
yading@10:         len = avio_close_dyn_buf(s, &ret);                                     \
yading@10:         ret[len - 1] = 0;                                                      \
yading@10:         return ret;                                                            \
yading@10:     } else                                                                     \
yading@10:         return NULL;                                                           \
yading@10: }
yading@10: 
yading@10: // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
yading@10: //                   GET_PIX_FMT_NAME)
yading@10: 
yading@10: DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
yading@10:                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
yading@10: 
yading@10: DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
yading@10:                   GET_SAMPLE_RATE_NAME)
yading@10: 
yading@10: DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
yading@10:                   GET_CH_LAYOUT_NAME)
yading@10: 
yading@10: FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
yading@10: {
yading@10:     FilterGraph *fg = av_mallocz(sizeof(*fg));
yading@10: 
yading@10:     if (!fg)
yading@10:         exit(1);
yading@10:     fg->index = nb_filtergraphs;
yading@10: 
yading@10:     GROW_ARRAY(fg->outputs, fg->nb_outputs);
yading@10:     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
yading@10:         exit(1);
yading@10:     fg->outputs[0]->ost   = ost;
yading@10:     fg->outputs[0]->graph = fg;
yading@10: 
yading@10:     ost->filter = fg->outputs[0];
yading@10: 
yading@10:     GROW_ARRAY(fg->inputs, fg->nb_inputs);
yading@10:     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
yading@10:         exit(1);
yading@10:     fg->inputs[0]->ist   = ist;
yading@10:     fg->inputs[0]->graph = fg;
yading@10: 
yading@10:     GROW_ARRAY(ist->filters, ist->nb_filters);
yading@10:     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
yading@10: 
yading@10:     GROW_ARRAY(filtergraphs, nb_filtergraphs);
yading@10:     filtergraphs[nb_filtergraphs - 1] = fg;
yading@10: 
yading@10:     return fg;
yading@10: }
yading@10: 
yading@10: static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
yading@10: {
yading@10:     InputStream *ist = NULL;
yading@10:     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
yading@10:     int i;
yading@10: 
yading@10:     // TODO: support other filter types
yading@10:     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
yading@10:         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
yading@10:                "currently.\n");
yading@10:         exit(1);
yading@10:     }
yading@10: 
yading@10:     if (in->name) {
yading@10:         AVFormatContext *s;
yading@10:         AVStream       *st = NULL;
yading@10:         char *p;
yading@10:         int file_idx = strtol(in->name, &p, 0);
yading@10: 
yading@10:         if (file_idx < 0 || file_idx >= nb_input_files) {
yading@10:             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
yading@10:                    file_idx, fg->graph_desc);
yading@10:             exit(1);
yading@10:         }
yading@10:         s = input_files[file_idx]->ctx;
yading@10: 
yading@10:         for (i = 0; i < s->nb_streams; i++) {
yading@10:             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
yading@10:             if (stream_type != type &&
yading@10:                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
yading@10:                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
yading@10:                 continue;
yading@10:             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
yading@10:                 st = s->streams[i];
yading@10:                 break;
yading@10:             }
yading@10:         }
yading@10:         if (!st) {
yading@10:             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
yading@10:                    "matches no streams.\n", p, fg->graph_desc);
yading@10:             exit(1);
yading@10:         }
yading@10:         ist = input_streams[input_files[file_idx]->ist_index + st->index];
yading@10:     } else {
yading@10:         /* find the first unused stream of corresponding type */
yading@10:         for (i = 0; i < nb_input_streams; i++) {
yading@10:             ist = input_streams[i];
yading@10:             if (ist->st->codec->codec_type == type && ist->discard)
yading@10:                 break;
yading@10:         }
yading@10:         if (i == nb_input_streams) {
yading@10:             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
yading@10:                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
yading@10:                    in->filter_ctx->name);
yading@10:             exit(1);
yading@10:         }
yading@10:     }
yading@10:     av_assert0(ist);
yading@10: 
yading@10:     ist->discard         = 0;
yading@10:     ist->decoding_needed++;
yading@10:     ist->st->discard = AVDISCARD_NONE;
yading@10: 
yading@10:     GROW_ARRAY(fg->inputs, fg->nb_inputs);
yading@10:     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
yading@10:         exit(1);
yading@10:     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
yading@10:     fg->inputs[fg->nb_inputs - 1]->graph = fg;
yading@10: 
yading@10:     GROW_ARRAY(ist->filters, ist->nb_filters);
yading@10:     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
yading@10: }
yading@10: 
yading@10: static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
yading@10: {
yading@10:     char *pix_fmts;
yading@10:     OutputStream *ost = ofilter->ost;
yading@10:     AVCodecContext *codec = ost->st->codec;
yading@10:     AVFilterContext *last_filter = out->filter_ctx;
yading@10:     int pad_idx = out->pad_idx;
yading@10:     int ret;
yading@10:     char name[255];
yading@10: 
yading@10:     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
yading@10:     ret = avfilter_graph_create_filter(&ofilter->filter,
yading@10:                                        avfilter_get_by_name("buffersink"),
yading@10:                                        name, NULL, NULL, fg->graph);
yading@10: 
yading@10:     if (ret < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (codec->width || codec->height) {
yading@10:         char args[255];
yading@10:         AVFilterContext *filter;
yading@10: 
yading@10:         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
yading@10:                  codec->width,
yading@10:                  codec->height,
yading@10:                  (unsigned)ost->sws_flags);
yading@10:         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
yading@10:                  ost->file_index, ost->index);
yading@10:         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
yading@10:                                                 name, args, NULL, fg->graph)) < 0)
yading@10:             return ret;
yading@10:         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         last_filter = filter;
yading@10:         pad_idx = 0;
yading@10:     }
yading@10: 
yading@10:     if ((pix_fmts = choose_pix_fmts(ost))) {
yading@10:         AVFilterContext *filter;
yading@10:         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
yading@10:                  ost->file_index, ost->index);
yading@10:         if ((ret = avfilter_graph_create_filter(&filter,
yading@10:                                                 avfilter_get_by_name("format"),
yading@10:                                                 "format", pix_fmts, NULL,
yading@10:                                                 fg->graph)) < 0)
yading@10:             return ret;
yading@10:         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         last_filter = filter;
yading@10:         pad_idx     = 0;
yading@10:         av_freep(&pix_fmts);
yading@10:     }
yading@10: 
yading@10:     if (ost->frame_rate.num && 0) {
yading@10:         AVFilterContext *fps;
yading@10:         char args[255];
yading@10: 
yading@10:         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
yading@10:                  ost->frame_rate.den);
yading@10:         snprintf(name, sizeof(name), "fps for output stream %d:%d",
yading@10:                  ost->file_index, ost->index);
yading@10:         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
yading@10:                                            name, args, NULL, fg->graph);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10: 
yading@10:         ret = avfilter_link(last_filter, pad_idx, fps, 0);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:         last_filter = fps;
yading@10:         pad_idx = 0;
yading@10:     }
yading@10: 
yading@10:     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
yading@10: {
yading@10:     OutputStream *ost = ofilter->ost;
yading@10:     AVCodecContext *codec  = ost->st->codec;
yading@10:     AVFilterContext *last_filter = out->filter_ctx;
yading@10:     int pad_idx = out->pad_idx;
yading@10:     char *sample_fmts, *sample_rates, *channel_layouts;
yading@10:     char name[255];
yading@10:     int ret;
yading@10: 
yading@10:     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
yading@10:     ret = avfilter_graph_create_filter(&ofilter->filter,
yading@10:                                        avfilter_get_by_name("abuffersink"),
yading@10:                                        name, NULL, NULL, fg->graph);
yading@10:     if (ret < 0)
yading@10:         return ret;
yading@10:     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
yading@10:         return ret;
yading@10: 
yading@10: #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
yading@10:     AVFilterContext *filt_ctx;                                              \
yading@10:                                                                             \
yading@10:     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
yading@10:            "similarly to -af " filter_name "=%s.\n", arg);                  \
yading@10:                                                                             \
yading@10:     ret = avfilter_graph_create_filter(&filt_ctx,                           \
yading@10:                                        avfilter_get_by_name(filter_name),   \
yading@10:                                        filter_name, arg, NULL, fg->graph);  \
yading@10:     if (ret < 0)                                                            \
yading@10:         return ret;                                                         \
yading@10:                                                                             \
yading@10:     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
yading@10:     if (ret < 0)                                                            \
yading@10:         return ret;                                                         \
yading@10:                                                                             \
yading@10:     last_filter = filt_ctx;                                                 \
yading@10:     pad_idx = 0;                                                            \
yading@10: } while (0)
yading@10:     if (ost->audio_channels_mapped) {
yading@10:         int i;
yading@10:         AVBPrint pan_buf;
yading@10:         av_bprint_init(&pan_buf, 256, 8192);
yading@10:         av_bprintf(&pan_buf, "0x%"PRIx64,
yading@10:                    av_get_default_channel_layout(ost->audio_channels_mapped));
yading@10:         for (i = 0; i < ost->audio_channels_mapped; i++)
yading@10:             if (ost->audio_channels_map[i] != -1)
yading@10:                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
yading@10: 
yading@10:         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
yading@10:         av_bprint_finalize(&pan_buf, NULL);
yading@10:     }
yading@10: 
yading@10:     if (codec->channels && !codec->channel_layout)
yading@10:         codec->channel_layout = av_get_default_channel_layout(codec->channels);
yading@10: 
yading@10:     sample_fmts     = choose_sample_fmts(ost);
yading@10:     sample_rates    = choose_sample_rates(ost);
yading@10:     channel_layouts = choose_channel_layouts(ost);
yading@10:     if (sample_fmts || sample_rates || channel_layouts) {
yading@10:         AVFilterContext *format;
yading@10:         char args[256];
yading@10:         args[0] = 0;
yading@10: 
yading@10:         if (sample_fmts)
yading@10:             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
yading@10:                             sample_fmts);
yading@10:         if (sample_rates)
yading@10:             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
yading@10:                             sample_rates);
yading@10:         if (channel_layouts)
yading@10:             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
yading@10:                             channel_layouts);
yading@10: 
yading@10:         av_freep(&sample_fmts);
yading@10:         av_freep(&sample_rates);
yading@10:         av_freep(&channel_layouts);
yading@10: 
yading@10:         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
yading@10:                  ost->file_index, ost->index);
yading@10:         ret = avfilter_graph_create_filter(&format,
yading@10:                                            avfilter_get_by_name("aformat"),
yading@10:                                            name, args, NULL, fg->graph);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10: 
yading@10:         ret = avfilter_link(last_filter, pad_idx, format, 0);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10: 
yading@10:         last_filter = format;
yading@10:         pad_idx = 0;
yading@10:     }
yading@10: 
yading@10:     if (audio_volume != 256 && 0) {
yading@10:         char args[256];
yading@10: 
yading@10:         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
yading@10:         AUTO_INSERT_FILTER("-vol", "volume", args);
yading@10:     }
yading@10: 
yading@10:     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
yading@10: {                                                                  \
yading@10:     AVFilterContext *ctx = inout->filter_ctx;                      \
yading@10:     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
yading@10:     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
yading@10:     AVIOContext *pb;                                               \
yading@10:                                                                    \
yading@10:     if (avio_open_dyn_buf(&pb) < 0)                                \
yading@10:         exit(1);                                                   \
yading@10:                                                                    \
yading@10:     avio_printf(pb, "%s", ctx->filter->name);                      \
yading@10:     if (nb_pads > 1)                                               \
yading@10:         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
yading@10:     avio_w8(pb, 0);                                                \
yading@10:     avio_close_dyn_buf(pb, &f->name);                              \
yading@10: }
yading@10: 
yading@10: int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
yading@10: {
yading@10:     av_freep(&ofilter->name);
yading@10:     DESCRIBE_FILTER_LINK(ofilter, out, 0);
yading@10: 
yading@10:     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
yading@10:     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
yading@10:     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
yading@10:     default: av_assert0(0);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int sub2video_prepare(InputStream *ist)
yading@10: {
yading@10:     AVFormatContext *avf = input_files[ist->file_index]->ctx;
yading@10:     int i, w, h;
yading@10: 
yading@10:     /* Compute the size of the canvas for the subtitles stream.
yading@10:        If the subtitles codec has set a size, use it. Otherwise use the
yading@10:        maximum dimensions of the video streams in the same file. */
yading@10:     w = ist->st->codec->width;
yading@10:     h = ist->st->codec->height;
yading@10:     if (!(w && h)) {
yading@10:         for (i = 0; i < avf->nb_streams; i++) {
yading@10:             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
yading@10:                 w = FFMAX(w, avf->streams[i]->codec->width);
yading@10:                 h = FFMAX(h, avf->streams[i]->codec->height);
yading@10:             }
yading@10:         }
yading@10:         if (!(w && h)) {
yading@10:             w = FFMAX(w, 720);
yading@10:             h = FFMAX(h, 576);
yading@10:         }
yading@10:         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
yading@10:     }
yading@10:     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
yading@10:     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
yading@10: 
yading@10:     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
yading@10:        palettes for all rectangles are identical or compatible */
yading@10:     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
yading@10: 
yading@10:     ist->sub2video.frame = av_frame_alloc();
yading@10:     if (!ist->sub2video.frame)
yading@10:         return AVERROR(ENOMEM);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
yading@10:                                         AVFilterInOut *in)
yading@10: {
yading@10:     AVFilterContext *first_filter = in->filter_ctx;
yading@10:     AVFilter *filter = avfilter_get_by_name("buffer");
yading@10:     InputStream *ist = ifilter->ist;
yading@10:     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
yading@10:                                          ist->st->time_base;
yading@10:     AVRational fr = ist->framerate;
yading@10:     AVRational sar;
yading@10:     AVBPrint args;
yading@10:     char name[255];
yading@10:     int pad_idx = in->pad_idx;
yading@10:     int ret;
yading@10: 
yading@10:     if (!fr.num)
yading@10:         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
yading@10: 
yading@10:     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
yading@10:         ret = sub2video_prepare(ist);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     sar = ist->st->sample_aspect_ratio.num ?
yading@10:           ist->st->sample_aspect_ratio :
yading@10:           ist->st->codec->sample_aspect_ratio;
yading@10:     if(!sar.den)
yading@10:         sar = (AVRational){0,1};
yading@10:     av_bprint_init(&args, 0, 1);
yading@10:     av_bprintf(&args,
yading@10:              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
yading@10:              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
yading@10:              ist->resample_height, ist->resample_pix_fmt,
yading@10:              tb.num, tb.den, sar.num, sar.den,
yading@10:              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
yading@10:     if (fr.num && fr.den)
yading@10:         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
yading@10:     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
yading@10:              ist->file_index, ist->st->index);
yading@10: 
yading@10:     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
yading@10:                                             args.str, NULL, fg->graph)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (ist->framerate.num) {
yading@10:         AVFilterContext *setpts;
yading@10: 
yading@10:         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
yading@10:                  ist->file_index, ist->st->index);
yading@10:         if ((ret = avfilter_graph_create_filter(&setpts,
yading@10:                                                 avfilter_get_by_name("setpts"),
yading@10:                                                 name, "N", NULL,
yading@10:                                                 fg->graph)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         first_filter = setpts;
yading@10:         pad_idx = 0;
yading@10:     }
yading@10: 
yading@10:     if (do_deinterlace) {
yading@10:         AVFilterContext *yadif;
yading@10: 
yading@10:         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
yading@10:                  ist->file_index, ist->st->index);
yading@10:         if ((ret = avfilter_graph_create_filter(&yadif,
yading@10:                                                 avfilter_get_by_name("yadif"),
yading@10:                                                 name, "", NULL,
yading@10:                                                 fg->graph)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         if ((ret = avfilter_link(yadif, 0, first_filter, pad_idx)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         first_filter = yadif;
yading@10:         pad_idx = 0;
yading@10:     }
yading@10: 
yading@10:     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
yading@10:         return ret;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
yading@10:                                         AVFilterInOut *in)
yading@10: {
yading@10:     AVFilterContext *first_filter = in->filter_ctx;
yading@10:     AVFilter *filter = avfilter_get_by_name("abuffer");
yading@10:     InputStream *ist = ifilter->ist;
yading@10:     int pad_idx = in->pad_idx;
yading@10:     AVBPrint args;
yading@10:     char name[255];
yading@10:     int ret;
yading@10: 
yading@10:     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
yading@10:     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
yading@10:              1, ist->st->codec->sample_rate,
yading@10:              ist->st->codec->sample_rate,
yading@10:              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
yading@10:     if (ist->st->codec->channel_layout)
yading@10:         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
yading@10:                    ist->st->codec->channel_layout);
yading@10:     else
yading@10:         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
yading@10:     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
yading@10:              ist->file_index, ist->st->index);
yading@10: 
yading@10:     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
yading@10:                                             name, args.str, NULL,
yading@10:                                             fg->graph)) < 0)
yading@10:         return ret;
yading@10: 
yading@10: #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
yading@10:     AVFilterContext *filt_ctx;                                              \
yading@10:                                                                             \
yading@10:     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
yading@10:            "similarly to -af " filter_name "=%s.\n", arg);                  \
yading@10:                                                                             \
yading@10:     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
yading@10:                 fg->index, filter_name, ist->file_index, ist->st->index);   \
yading@10:     ret = avfilter_graph_create_filter(&filt_ctx,                           \
yading@10:                                        avfilter_get_by_name(filter_name),   \
yading@10:                                        name, arg, NULL, fg->graph);         \
yading@10:     if (ret < 0)                                                            \
yading@10:         return ret;                                                         \
yading@10:                                                                             \
yading@10:     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
yading@10:     if (ret < 0)                                                            \
yading@10:         return ret;                                                         \
yading@10:                                                                             \
yading@10:     first_filter = filt_ctx;                                                  \
yading@10: } while (0)
yading@10: 
yading@10:     if (audio_sync_method > 0) {
yading@10:         char args[256] = {0};
yading@10: 
yading@10:         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
yading@10:         if (audio_drift_threshold != 0.1)
yading@10:             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
yading@10:         if (!fg->reconfiguration)
yading@10:             av_strlcatf(args, sizeof(args), ":first_pts=0");
yading@10:         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
yading@10:     }
yading@10: 
yading@10: //     if (ost->audio_channels_mapped) {
yading@10: //         int i;
yading@10: //         AVBPrint pan_buf;
yading@10: //         av_bprint_init(&pan_buf, 256, 8192);
yading@10: //         av_bprintf(&pan_buf, "0x%"PRIx64,
yading@10: //                    av_get_default_channel_layout(ost->audio_channels_mapped));
yading@10: //         for (i = 0; i < ost->audio_channels_mapped; i++)
yading@10: //             if (ost->audio_channels_map[i] != -1)
yading@10: //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
yading@10: //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
yading@10: //         av_bprint_finalize(&pan_buf, NULL);
yading@10: //     }
yading@10: 
yading@10:     if (audio_volume != 256) {
yading@10:         char args[256];
yading@10: 
yading@10:         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
yading@10:                "audio filter instead.\n");
yading@10: 
yading@10:         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
yading@10:         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
yading@10:     }
yading@10:     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
yading@10:                                   AVFilterInOut *in)
yading@10: {
yading@10:     av_freep(&ifilter->name);
yading@10:     DESCRIBE_FILTER_LINK(ifilter, in, 1);
yading@10: 
yading@10:     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
yading@10:     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
yading@10:     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
yading@10:     default: av_assert0(0);
yading@10:     }
yading@10: }
yading@10: 
yading@10: int configure_filtergraph(FilterGraph *fg)
yading@10: {
yading@10:     AVFilterInOut *inputs, *outputs, *cur;
yading@10:     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
yading@10:     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
yading@10:                                       fg->graph_desc;
yading@10: 
yading@10:     avfilter_graph_free(&fg->graph);
yading@10:     if (!(fg->graph = avfilter_graph_alloc()))
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     if (simple) {
yading@10:         OutputStream *ost = fg->outputs[0]->ost;
yading@10:         char args[512];
yading@10:         AVDictionaryEntry *e = NULL;
yading@10: 
yading@10:         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
yading@10:         fg->graph->scale_sws_opts = av_strdup(args);
yading@10: 
yading@10:         args[0] = 0;
yading@10:         while ((e = av_dict_get(ost->swr_opts, "", e,
yading@10:                                 AV_DICT_IGNORE_SUFFIX))) {
yading@10:             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
yading@10:         }
yading@10:         if (strlen(args))
yading@10:             args[strlen(args)-1] = 0;
yading@10:         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
yading@10: 
yading@10:         args[0] = '\0';
yading@10:         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
yading@10:                                 AV_DICT_IGNORE_SUFFIX))) {
yading@10:             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
yading@10:         }
yading@10:         if (strlen(args))
yading@10:             args[strlen(args) - 1] = '\0';
yading@10:         fg->graph->resample_lavr_opts = av_strdup(args);
yading@10:     }
yading@10: 
yading@10:     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
yading@10:         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
yading@10:                "exactly one input and output.\n", graph_desc);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     for (cur = inputs; !simple && init && cur; cur = cur->next)
yading@10:         init_input_filter(fg, cur);
yading@10: 
yading@10:     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
yading@10:         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
yading@10:             return ret;
yading@10:     avfilter_inout_free(&inputs);
yading@10: 
yading@10:     if (!init || simple) {
yading@10:         /* we already know the mappings between lavfi outputs and output streams,
yading@10:          * so we can finish the setup */
yading@10:         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
yading@10:             configure_output_filter(fg, fg->outputs[i], cur);
yading@10:         avfilter_inout_free(&outputs);
yading@10: 
yading@10:         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
yading@10:             return ret;
yading@10:     } else {
yading@10:         /* wait until output mappings are processed */
yading@10:         for (cur = outputs; cur;) {
yading@10:             GROW_ARRAY(fg->outputs, fg->nb_outputs);
yading@10:             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
yading@10:                 exit(1);
yading@10:             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
yading@10:             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
yading@10:             cur = cur->next;
yading@10:             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     fg->reconfiguration = 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
yading@10: {
yading@10:     int i;
yading@10:     for (i = 0; i < fg->nb_inputs; i++)
yading@10:         if (fg->inputs[i]->ist == ist)
yading@10:             return 1;
yading@10:     return 0;
yading@10: }
yading@10: