| /* |
| * Copyright (c) 2012 Nicolas George |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * concat audio-video filter |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/opt.h" |
| #include "avfilter.h" |
| #define FF_BUFQUEUE_SIZE 256 |
| #include "bufferqueue.h" |
| #include "internal.h" |
| #include "video.h" |
| #include "audio.h" |
| |
| #define TYPE_ALL 2 |
| |
| typedef struct { |
| const AVClass *class; |
| unsigned nb_streams[TYPE_ALL]; /**< number of out streams of each type */ |
| unsigned nb_segments; |
| unsigned cur_idx; /**< index of the first input of current segment */ |
| int64_t delta_ts; /**< timestamp to add to produce output timestamps */ |
| unsigned nb_in_active; /**< number of active inputs in current segment */ |
| unsigned unsafe; |
| struct concat_in { |
| int64_t pts; |
| int64_t nb_frames; |
| unsigned eof; |
| struct FFBufQueue queue; |
| } *in; |
| } ConcatContext; |
| |
| #define OFFSET(x) offsetof(ConcatContext, x) |
| #define A AV_OPT_FLAG_AUDIO_PARAM |
| #define F AV_OPT_FLAG_FILTERING_PARAM |
| #define V AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption concat_options[] = { |
| { "n", "specify the number of segments", OFFSET(nb_segments), |
| AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, V|A|F}, |
| { "v", "specify the number of video streams", |
| OFFSET(nb_streams[AVMEDIA_TYPE_VIDEO]), |
| AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, V|F }, |
| { "a", "specify the number of audio streams", |
| OFFSET(nb_streams[AVMEDIA_TYPE_AUDIO]), |
| AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A|F}, |
| { "unsafe", "enable unsafe mode", |
| OFFSET(unsafe), |
| AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, V|A|F}, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(concat); |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| ConcatContext *cat = ctx->priv; |
| unsigned type, nb_str, idx0 = 0, idx, str, seg; |
| AVFilterFormats *formats, *rates = NULL; |
| AVFilterChannelLayouts *layouts = NULL; |
| int ret; |
| |
| for (type = 0; type < TYPE_ALL; type++) { |
| nb_str = cat->nb_streams[type]; |
| for (str = 0; str < nb_str; str++) { |
| idx = idx0; |
| |
| /* Set the output formats */ |
| formats = ff_all_formats(type); |
| if ((ret = ff_formats_ref(formats, &ctx->outputs[idx]->in_formats)) < 0) |
| return ret; |
| |
| if (type == AVMEDIA_TYPE_AUDIO) { |
| rates = ff_all_samplerates(); |
| if ((ret = ff_formats_ref(rates, &ctx->outputs[idx]->in_samplerates)) < 0) |
| return ret; |
| layouts = ff_all_channel_layouts(); |
| if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->in_channel_layouts)) < 0) |
| return ret; |
| } |
| |
| /* Set the same formats for each corresponding input */ |
| for (seg = 0; seg < cat->nb_segments; seg++) { |
| if ((ret = ff_formats_ref(formats, &ctx->inputs[idx]->out_formats)) < 0) |
| return ret; |
| if (type == AVMEDIA_TYPE_AUDIO) { |
| if ((ret = ff_formats_ref(rates, &ctx->inputs[idx]->out_samplerates)) < 0 || |
| (ret = ff_channel_layouts_ref(layouts, &ctx->inputs[idx]->out_channel_layouts)) < 0) |
| return ret; |
| } |
| idx += ctx->nb_outputs; |
| } |
| |
| idx0++; |
| } |
| } |
| return 0; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| ConcatContext *cat = ctx->priv; |
| unsigned out_no = FF_OUTLINK_IDX(outlink); |
| unsigned in_no = out_no, seg; |
| AVFilterLink *inlink = ctx->inputs[in_no]; |
| |
| /* enhancement: find a common one */ |
| outlink->time_base = AV_TIME_BASE_Q; |
| outlink->w = inlink->w; |
| outlink->h = inlink->h; |
| outlink->sample_aspect_ratio = inlink->sample_aspect_ratio; |
| outlink->format = inlink->format; |
| for (seg = 1; seg < cat->nb_segments; seg++) { |
| inlink = ctx->inputs[in_no += ctx->nb_outputs]; |
| if (!outlink->sample_aspect_ratio.num) |
| outlink->sample_aspect_ratio = inlink->sample_aspect_ratio; |
| /* possible enhancement: unsafe mode, do not check */ |
| if (outlink->w != inlink->w || |
| outlink->h != inlink->h || |
| outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num && |
| inlink->sample_aspect_ratio.num || |
| outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) { |
| av_log(ctx, AV_LOG_ERROR, "Input link %s parameters " |
| "(size %dx%d, SAR %d:%d) do not match the corresponding " |
| "output link %s parameters (%dx%d, SAR %d:%d)\n", |
| ctx->input_pads[in_no].name, inlink->w, inlink->h, |
| inlink->sample_aspect_ratio.num, |
| inlink->sample_aspect_ratio.den, |
| ctx->input_pads[out_no].name, outlink->w, outlink->h, |
| outlink->sample_aspect_ratio.num, |
| outlink->sample_aspect_ratio.den); |
| if (!cat->unsafe) |
| return AVERROR(EINVAL); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf) |
| { |
| ConcatContext *cat = ctx->priv; |
| unsigned out_no = in_no % ctx->nb_outputs; |
| AVFilterLink * inlink = ctx-> inputs[ in_no]; |
| AVFilterLink *outlink = ctx->outputs[out_no]; |
| struct concat_in *in = &cat->in[in_no]; |
| |
| buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base); |
| in->pts = buf->pts; |
| in->nb_frames++; |
| /* add duration to input PTS */ |
| if (inlink->sample_rate) |
| /* use number of audio samples */ |
| in->pts += av_rescale_q(buf->nb_samples, |
| av_make_q(1, inlink->sample_rate), |
| outlink->time_base); |
| else if (in->nb_frames >= 2) |
| /* use mean duration */ |
| in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1); |
| |
| buf->pts += cat->delta_ts; |
| return ff_filter_frame(outlink, buf); |
| } |
| |
| static int process_frame(AVFilterLink *inlink, AVFrame *buf) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| ConcatContext *cat = ctx->priv; |
| unsigned in_no = FF_INLINK_IDX(inlink); |
| |
| if (in_no < cat->cur_idx) { |
| av_log(ctx, AV_LOG_ERROR, "Frame after EOF on input %s\n", |
| ctx->input_pads[in_no].name); |
| av_frame_free(&buf); |
| } else if (in_no >= cat->cur_idx + ctx->nb_outputs) { |
| ff_bufqueue_add(ctx, &cat->in[in_no].queue, buf); |
| } else { |
| return push_frame(ctx, in_no, buf); |
| } |
| return 0; |
| } |
| |
| static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| unsigned in_no = FF_INLINK_IDX(inlink); |
| AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs]; |
| |
| return ff_get_video_buffer(outlink, w, h); |
| } |
| |
| static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| unsigned in_no = FF_INLINK_IDX(inlink); |
| AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs]; |
| |
| return ff_get_audio_buffer(outlink, nb_samples); |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
| { |
| return process_frame(inlink, buf); |
| } |
| |
| static void close_input(AVFilterContext *ctx, unsigned in_no) |
| { |
| ConcatContext *cat = ctx->priv; |
| |
| cat->in[in_no].eof = 1; |
| cat->nb_in_active--; |
| av_log(ctx, AV_LOG_VERBOSE, "EOF on %s, %d streams left in segment.\n", |
| ctx->input_pads[in_no].name, cat->nb_in_active); |
| } |
| |
| static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta) |
| { |
| ConcatContext *cat = ctx->priv; |
| unsigned i = cat->cur_idx; |
| unsigned imax = i + ctx->nb_outputs; |
| int64_t pts; |
| |
| pts = cat->in[i++].pts; |
| for (; i < imax; i++) |
| pts = FFMAX(pts, cat->in[i].pts); |
| cat->delta_ts += pts; |
| *seg_delta = pts; |
| } |
| |
| static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no, |
| int64_t seg_delta) |
| { |
| ConcatContext *cat = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[out_no]; |
| int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta; |
| int64_t nb_samples, sent = 0; |
| int frame_nb_samples, ret; |
| AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate }; |
| AVFrame *buf; |
| int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout); |
| |
| if (!rate_tb.den) |
| return AVERROR_BUG; |
| nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts, |
| outlink->time_base, rate_tb); |
| frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */ |
| while (nb_samples) { |
| frame_nb_samples = FFMIN(frame_nb_samples, nb_samples); |
| buf = ff_get_audio_buffer(outlink, frame_nb_samples); |
| if (!buf) |
| return AVERROR(ENOMEM); |
| av_samples_set_silence(buf->extended_data, 0, frame_nb_samples, |
| nb_channels, outlink->format); |
| buf->pts = base_pts + av_rescale_q(sent, rate_tb, outlink->time_base); |
| ret = ff_filter_frame(outlink, buf); |
| if (ret < 0) |
| return ret; |
| sent += frame_nb_samples; |
| nb_samples -= frame_nb_samples; |
| } |
| return 0; |
| } |
| |
| static int flush_segment(AVFilterContext *ctx) |
| { |
| int ret; |
| ConcatContext *cat = ctx->priv; |
| unsigned str, str_max; |
| int64_t seg_delta; |
| |
| find_next_delta_ts(ctx, &seg_delta); |
| cat->cur_idx += ctx->nb_outputs; |
| cat->nb_in_active = ctx->nb_outputs; |
| av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n", |
| cat->delta_ts); |
| |
| if (cat->cur_idx < ctx->nb_inputs) { |
| /* pad audio streams with silence */ |
| str = cat->nb_streams[AVMEDIA_TYPE_VIDEO]; |
| str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO]; |
| for (; str < str_max; str++) { |
| ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str, |
| seg_delta); |
| if (ret < 0) |
| return ret; |
| } |
| /* flush queued buffers */ |
| /* possible enhancement: flush in PTS order */ |
| str_max = cat->cur_idx + ctx->nb_outputs; |
| for (str = cat->cur_idx; str < str_max; str++) { |
| while (cat->in[str].queue.available) { |
| ret = push_frame(ctx, str, ff_bufqueue_get(&cat->in[str].queue)); |
| if (ret < 0) |
| return ret; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static int request_frame(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| ConcatContext *cat = ctx->priv; |
| unsigned out_no = FF_OUTLINK_IDX(outlink); |
| unsigned in_no = out_no + cat->cur_idx; |
| unsigned str, str_max; |
| int ret; |
| |
| while (1) { |
| if (in_no >= ctx->nb_inputs) |
| return AVERROR_EOF; |
| if (!cat->in[in_no].eof) { |
| ret = ff_request_frame(ctx->inputs[in_no]); |
| if (ret != AVERROR_EOF) |
| return ret; |
| close_input(ctx, in_no); |
| } |
| /* cycle on all inputs to finish the segment */ |
| /* possible enhancement: request in PTS order */ |
| str_max = cat->cur_idx + ctx->nb_outputs - 1; |
| for (str = cat->cur_idx; cat->nb_in_active; |
| str = str == str_max ? cat->cur_idx : str + 1) { |
| if (cat->in[str].eof) |
| continue; |
| ret = ff_request_frame(ctx->inputs[str]); |
| if (ret != AVERROR_EOF) |
| return ret; |
| close_input(ctx, str); |
| } |
| ret = flush_segment(ctx); |
| if (ret < 0) |
| return ret; |
| in_no += ctx->nb_outputs; |
| } |
| } |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| ConcatContext *cat = ctx->priv; |
| unsigned seg, type, str; |
| |
| /* create input pads */ |
| for (seg = 0; seg < cat->nb_segments; seg++) { |
| for (type = 0; type < TYPE_ALL; type++) { |
| for (str = 0; str < cat->nb_streams[type]; str++) { |
| AVFilterPad pad = { |
| .type = type, |
| .get_video_buffer = get_video_buffer, |
| .get_audio_buffer = get_audio_buffer, |
| .filter_frame = filter_frame, |
| }; |
| pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str); |
| ff_insert_inpad(ctx, ctx->nb_inputs, &pad); |
| } |
| } |
| } |
| /* create output pads */ |
| for (type = 0; type < TYPE_ALL; type++) { |
| for (str = 0; str < cat->nb_streams[type]; str++) { |
| AVFilterPad pad = { |
| .type = type, |
| .config_props = config_output, |
| .request_frame = request_frame, |
| }; |
| pad.name = av_asprintf("out:%c%d", "va"[type], str); |
| ff_insert_outpad(ctx, ctx->nb_outputs, &pad); |
| } |
| } |
| |
| cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in)); |
| if (!cat->in) |
| return AVERROR(ENOMEM); |
| cat->nb_in_active = ctx->nb_outputs; |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| ConcatContext *cat = ctx->priv; |
| unsigned i; |
| |
| for (i = 0; i < ctx->nb_inputs; i++) { |
| av_freep(&ctx->input_pads[i].name); |
| ff_bufqueue_discard_all(&cat->in[i].queue); |
| } |
| for (i = 0; i < ctx->nb_outputs; i++) |
| av_freep(&ctx->output_pads[i].name); |
| av_freep(&cat->in); |
| } |
| |
| AVFilter ff_avf_concat = { |
| .name = "concat", |
| .description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."), |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .priv_size = sizeof(ConcatContext), |
| .inputs = NULL, |
| .outputs = NULL, |
| .priv_class = &concat_class, |
| .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS, |
| }; |