[FFmpeg-cvslog] doc/examples: Add example transcoding.c
Andrey Utkin
git at videolan.org
Mon Mar 17 21:03:48 CET 2014
ffmpeg | branch: master | Andrey Utkin <andrey.krieger.utkin at gmail.com> | Sun Mar 9 02:20:41 2014 +0200| [e10ab43614c1cccdeb656bf9d5431285a2f2d52f] | committer: Michael Niedermayer
doc/examples: Add example transcoding.c
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e10ab43614c1cccdeb656bf9d5431285a2f2d52f
---
configure | 2 +
doc/Makefile | 1 +
doc/examples/Makefile | 1 +
doc/examples/transcoding.c | 597 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 601 insertions(+)
diff --git a/configure b/configure
index 7e51d06..8b67be7 100755
--- a/configure
+++ b/configure
@@ -1272,6 +1272,7 @@ EXAMPLE_LIST="
resampling_audio_example
scaling_video_example
transcode_aac_example
+ transcoding_example
"
EXTERNAL_LIBRARY_LIST="
@@ -2482,6 +2483,7 @@ remuxing_example_deps="avcodec avformat avutil"
resampling_audio_example_deps="avutil swresample"
scaling_video_example_deps="avutil swscale"
transcode_aac_example_deps="avcodec avformat swresample"
+transcoding_example_deps="avfilter avcodec avformat avutil"
# libraries
avcodec_deps="avutil"
diff --git a/doc/Makefile b/doc/Makefile
index 44049c4..10f03cc 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -48,6 +48,7 @@ DOC_EXAMPLES-$(CONFIG_REMUXING_EXAMPLE) += remuxing
DOC_EXAMPLES-$(CONFIG_RESAMPLING_AUDIO_EXAMPLE) += resampling_audio
DOC_EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video
DOC_EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac
+DOC_EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding
ALL_DOC_EXAMPLES_LIST = $(DOC_EXAMPLES-) $(DOC_EXAMPLES-yes)
DOC_EXAMPLES := $(DOC_EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF))
diff --git a/doc/examples/Makefile b/doc/examples/Makefile
index 1553bab..646a63d 100644
--- a/doc/examples/Makefile
+++ b/doc/examples/Makefile
@@ -22,6 +22,7 @@ EXAMPLES= avio_reading \
resampling_audio \
scaling_video \
transcode_aac \
+ transcoding \
OBJS=$(addsuffix .o,$(EXAMPLES))
diff --git a/doc/examples/transcoding.c b/doc/examples/transcoding.c
new file mode 100644
index 0000000..93187fa
--- /dev/null
+++ b/doc/examples/transcoding.c
@@ -0,0 +1,597 @@
+/*
+ * Copyright (c) 2010 Nicolas George
+ * Copyright (c) 2011 Stefano Sabatini
+ * Copyright (c) 2014 Andrey Utkin
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * @file
+ * API example for demuxing, decoding, filtering, encoding and muxing
+ * @example doc/examples/transcoding.c
+ */
+
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavfilter/avfiltergraph.h>
+#include <libavfilter/avcodec.h>
+#include <libavfilter/buffersink.h>
+#include <libavfilter/buffersrc.h>
+#include <libavutil/opt.h>
+#include <libavutil/pixdesc.h>
+
+static AVFormatContext *ifmt_ctx;
+static AVFormatContext *ofmt_ctx;
+typedef struct FilteringContext {
+ AVFilterContext *buffersink_ctx;
+ AVFilterContext *buffersrc_ctx;
+ AVFilterGraph *filter_graph;
+} FilteringContext;
+static FilteringContext *filter_ctx;
+
+static int open_input_file(const char *filename)
+{
+ int ret;
+ unsigned int i;
+
+ ifmt_ctx = NULL;
+ if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
+ return ret;
+ }
+
+ if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
+ return ret;
+ }
+
+ for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+ AVStream *stream;
+ AVCodecContext *codec_ctx;
+ stream = ifmt_ctx->streams[i];
+ codec_ctx = stream->codec;
+ /* Reencode video & audio and remux subtitles etc. */
+ if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
+ || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+ /* Open decoder */
+ ret = avcodec_open2(codec_ctx,
+ avcodec_find_decoder(codec_ctx->codec_id), NULL);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
+ return ret;
+ }
+ }
+ }
+
+ av_dump_format(ifmt_ctx, 0, filename, 0);
+ return 0;
+}
+
+static int open_output_file(const char *filename)
+{
+ AVStream *out_stream;
+ AVStream *in_stream;
+ AVCodecContext *dec_ctx, *enc_ctx;
+ AVCodec *encoder;
+ int ret;
+ unsigned int i;
+
+ ofmt_ctx = NULL;
+ avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename);
+ if (!ofmt_ctx) {
+ av_log(NULL, AV_LOG_ERROR, "Could not create output context\n");
+ return AVERROR_UNKNOWN;
+ }
+
+
+ for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+ out_stream = avformat_new_stream(ofmt_ctx, NULL);
+ if (!out_stream) {
+ av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ in_stream = ifmt_ctx->streams[i];
+ dec_ctx = in_stream->codec;
+ enc_ctx = out_stream->codec;
+
+ if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
+ || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+ /* in this example, we choose transcoding to same codec */
+ encoder = avcodec_find_encoder(dec_ctx->codec_id);
+
+ /* In this example, we transcode to same properties (picture size,
+ * sample rate etc.). These properties can be changed for output
+ * streams easily using filters */
+ if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
+ enc_ctx->height = dec_ctx->height;
+ enc_ctx->width = dec_ctx->width;
+ enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
+ /* take first format from list of supported formats */
+ enc_ctx->pix_fmt = encoder->pix_fmts[0];
+ /* video time_base can be set to whatever is handy and supported by encoder */
+ enc_ctx->time_base = dec_ctx->time_base;
+ } else {
+ enc_ctx->sample_rate = dec_ctx->sample_rate;
+ enc_ctx->channel_layout = dec_ctx->channel_layout;
+ enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
+ /* take first format from list of supported formats */
+ enc_ctx->sample_fmt = encoder->sample_fmts[0];
+ enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate};
+ }
+
+ /* Third parameter can be used to pass settings to encoder */
+ ret = avcodec_open2(enc_ctx, encoder, NULL);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
+ return ret;
+ }
+ } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
+ av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
+ return AVERROR_INVALIDDATA;
+ } else {
+ /* if this stream must be remuxed */
+ ret = avcodec_copy_context(ofmt_ctx->streams[i]->codec,
+ ifmt_ctx->streams[i]->codec);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Copying stream context failed\n");
+ return ret;
+ }
+ }
+
+ if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
+ enc_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
+
+ }
+ av_dump_format(ofmt_ctx, 0, filename, 1);
+
+ if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
+ ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
+ return ret;
+ }
+ }
+
+ /* init muxer, write output file header */
+ ret = avformat_write_header(ofmt_ctx, NULL);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx,
+ AVCodecContext *enc_ctx, const char *filter_spec)
+{
+ char args[512];
+ int ret = 0;
+ AVFilter *buffersrc = NULL;
+ AVFilter *buffersink = NULL;
+ AVFilterContext *buffersrc_ctx = NULL;
+ AVFilterContext *buffersink_ctx = NULL;
+ AVFilterInOut *outputs = avfilter_inout_alloc();
+ AVFilterInOut *inputs = avfilter_inout_alloc();
+ AVFilterGraph *filter_graph = avfilter_graph_alloc();
+
+ if (!outputs || !inputs || !filter_graph) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+
+ if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
+ buffersrc = avfilter_get_by_name("buffer");
+ buffersink = avfilter_get_by_name("buffersink");
+ if (!buffersrc || !buffersink) {
+ av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
+ ret = AVERROR_UNKNOWN;
+ goto end;
+ }
+
+ snprintf(args, sizeof(args),
+ "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
+ dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
+ dec_ctx->time_base.num, dec_ctx->time_base.den,
+ dec_ctx->sample_aspect_ratio.num,
+ dec_ctx->sample_aspect_ratio.den);
+
+ ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
+ args, NULL, filter_graph);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
+ goto end;
+ }
+
+ ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
+ NULL, NULL, filter_graph);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
+ goto end;
+ }
+
+ ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
+ (uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
+ AV_OPT_SEARCH_CHILDREN);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
+ goto end;
+ }
+ } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+ buffersrc = avfilter_get_by_name("abuffer");
+ buffersink = avfilter_get_by_name("abuffersink");
+ if (!buffersrc || !buffersink) {
+ av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
+ ret = AVERROR_UNKNOWN;
+ goto end;
+ }
+
+ if (!dec_ctx->channel_layout)
+ dec_ctx->channel_layout =
+ av_get_default_channel_layout(dec_ctx->channels);
+ snprintf(args, sizeof(args),
+ "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64,
+ dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate,
+ av_get_sample_fmt_name(dec_ctx->sample_fmt),
+ dec_ctx->channel_layout);
+ ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
+ args, NULL, filter_graph);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
+ goto end;
+ }
+
+ ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
+ NULL, NULL, filter_graph);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
+ goto end;
+ }
+
+ ret = av_opt_set_bin(buffersink_ctx, "sample_fmts",
+ (uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt),
+ AV_OPT_SEARCH_CHILDREN);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
+ goto end;
+ }
+
+ ret = av_opt_set_bin(buffersink_ctx, "channel_layouts",
+ (uint8_t*)&enc_ctx->channel_layout,
+ sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
+ goto end;
+ }
+
+ ret = av_opt_set_bin(buffersink_ctx, "sample_rates",
+ (uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate),
+ AV_OPT_SEARCH_CHILDREN);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
+ goto end;
+ }
+ } else {
+ ret = AVERROR_UNKNOWN;
+ goto end;
+ }
+
+ /* Endpoints for the filter graph. */
+ outputs->name = av_strdup("in");
+ outputs->filter_ctx = buffersrc_ctx;
+ outputs->pad_idx = 0;
+ outputs->next = NULL;
+
+ inputs->name = av_strdup("out");
+ inputs->filter_ctx = buffersink_ctx;
+ inputs->pad_idx = 0;
+ inputs->next = NULL;
+
+ if (!outputs->name || !inputs->name) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+
+ if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
+ &inputs, &outputs, NULL)) < 0)
+ goto end;
+
+ if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
+ goto end;
+
+ /* Fill FilteringContext */
+ fctx->buffersrc_ctx = buffersrc_ctx;
+ fctx->buffersink_ctx = buffersink_ctx;
+ fctx->filter_graph = filter_graph;
+
+end:
+ avfilter_inout_free(&inputs);
+ avfilter_inout_free(&outputs);
+
+ return ret;
+}
+
+static int init_filters(void)
+{
+ const char *filter_spec;
+ unsigned int i;
+ int ret;
+ filter_ctx = av_malloc(sizeof(FilteringContext) * ifmt_ctx->nb_streams);
+ if (!filter_ctx)
+ return AVERROR(ENOMEM);
+
+ for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+ filter_ctx[i].buffersrc_ctx = NULL;
+ filter_ctx[i].buffersink_ctx = NULL;
+ filter_ctx[i].filter_graph = NULL;
+ if (!(ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO
+ || ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO))
+ continue;
+
+
+ if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
+ filter_spec = "null"; /* passthrough (dummy) filter for video */
+ else
+ filter_spec = "anull"; /* passthrough (dummy) filter for audio */
+ ret = init_filter(&filter_ctx[i], ifmt_ctx->streams[i]->codec,
+ ofmt_ctx->streams[i]->codec, filter_spec);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) {
+ int ret;
+ int got_frame_local;
+ AVPacket enc_pkt;
+ int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) =
+ (ifmt_ctx->streams[stream_index]->codec->codec_type ==
+ AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;
+
+ if (!got_frame)
+ got_frame = &got_frame_local;
+
+ av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
+ /* encode filtered frame */
+ enc_pkt.data = NULL;
+ enc_pkt.size = 0;
+ av_init_packet(&enc_pkt);
+ ret = enc_func(ofmt_ctx->streams[stream_index]->codec, &enc_pkt,
+ filt_frame, got_frame);
+ av_frame_free(&filt_frame);
+ if (ret < 0)
+ return ret;
+ if (!(*got_frame))
+ return 0;
+
+ /* prepare packet for muxing */
+ enc_pkt.stream_index = stream_index;
+ enc_pkt.dts = av_rescale_q_rnd(enc_pkt.dts,
+ ofmt_ctx->streams[stream_index]->codec->time_base,
+ ofmt_ctx->streams[stream_index]->time_base,
+ AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+ enc_pkt.pts = av_rescale_q_rnd(enc_pkt.pts,
+ ofmt_ctx->streams[stream_index]->codec->time_base,
+ ofmt_ctx->streams[stream_index]->time_base,
+ AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+ enc_pkt.duration = av_rescale_q(enc_pkt.duration,
+ ofmt_ctx->streams[stream_index]->codec->time_base,
+ ofmt_ctx->streams[stream_index]->time_base);
+
+ av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
+ /* mux encoded frame */
+ ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
+ return ret;
+}
+
+static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
+{
+ int ret;
+ AVFrame *filt_frame;
+
+ av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n");
+ /* push the decoded frame into the filtergraph */
+ ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx,
+ frame, 0);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
+ return ret;
+ }
+
+ /* pull filtered frames from the filtergraph */
+ while (1) {
+ filt_frame = av_frame_alloc();
+ if (!filt_frame) {
+ ret = AVERROR(ENOMEM);
+ break;
+ }
+ av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n");
+ ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx,
+ filt_frame);
+ if (ret < 0) {
+ /* if no more frames for output - returns AVERROR(EAGAIN)
+ * if flushed and no more frames for output - returns AVERROR_EOF
+ * rewrite retcode to 0 to show it as normal procedure completion
+ */
+ if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+ ret = 0;
+ av_frame_free(&filt_frame);
+ break;
+ }
+
+ filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
+ ret = encode_write_frame(filt_frame, stream_index, NULL);
+ if (ret < 0)
+ break;
+ }
+
+ return ret;
+}
+
+static int flush_encoder(unsigned int stream_index)
+{
+ int ret;
+ int got_frame;
+
+ if (!(ofmt_ctx->streams[stream_index]->codec->codec->capabilities &
+ CODEC_CAP_DELAY))
+ return 0;
+
+ while (1) {
+ av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index);
+ ret = encode_write_frame(NULL, stream_index, &got_frame);
+ if (ret < 0)
+ break;
+ if (!got_frame)
+ return 0;
+ }
+ return ret;
+}
+
+int main(int argc, char **argv)
+{
+ int ret;
+ AVPacket packet = { .data = NULL, .size = 0 };
+ AVFrame *frame = NULL;
+ enum AVMediaType type;
+ unsigned int stream_index;
+ unsigned int i;
+ int got_frame;
+ int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);
+
+ if (argc != 3) {
+ av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <output file>\n", argv[0]);
+ return 1;
+ }
+
+ av_register_all();
+ avfilter_register_all();
+
+ if ((ret = open_input_file(argv[1])) < 0)
+ goto end;
+ if ((ret = open_output_file(argv[2])) < 0)
+ goto end;
+ if ((ret = init_filters()) < 0)
+ goto end;
+
+ /* read all packets */
+ while (1) {
+ if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0)
+ break;
+ stream_index = packet.stream_index;
+ type = ifmt_ctx->streams[packet.stream_index]->codec->codec_type;
+ av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",
+ stream_index);
+
+ if (filter_ctx[stream_index].filter_graph) {
+ av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n");
+ frame = av_frame_alloc();
+ if (!frame) {
+ ret = AVERROR(ENOMEM);
+ break;
+ }
+ packet.dts = av_rescale_q_rnd(packet.dts,
+ ifmt_ctx->streams[stream_index]->time_base,
+ ifmt_ctx->streams[stream_index]->codec->time_base,
+ AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+ packet.pts = av_rescale_q_rnd(packet.pts,
+ ifmt_ctx->streams[stream_index]->time_base,
+ ifmt_ctx->streams[stream_index]->codec->time_base,
+ AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+ dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 :
+ avcodec_decode_audio4;
+ ret = dec_func(ifmt_ctx->streams[stream_index]->codec, frame,
+ &got_frame, &packet);
+ if (ret < 0) {
+ av_frame_free(&frame);
+ av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
+ break;
+ }
+
+ if (got_frame) {
+ frame->pts = av_frame_get_best_effort_timestamp(frame);
+ ret = filter_encode_write_frame(frame, stream_index);
+ av_frame_free(&frame);
+ if (ret < 0)
+ goto end;
+ } else {
+ av_frame_free(&frame);
+ }
+ } else {
+ /* remux this frame without reencoding */
+ packet.dts = av_rescale_q_rnd(packet.dts,
+ ifmt_ctx->streams[stream_index]->time_base,
+ ofmt_ctx->streams[stream_index]->time_base,
+ AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+ packet.pts = av_rescale_q_rnd(packet.pts,
+ ifmt_ctx->streams[stream_index]->time_base,
+ ofmt_ctx->streams[stream_index]->time_base,
+ AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+
+ ret = av_interleaved_write_frame(ofmt_ctx, &packet);
+ if (ret < 0)
+ goto end;
+ }
+ av_free_packet(&packet);
+ }
+
+ /* flush filters and encoders */
+ for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+ /* flush filter */
+ if (!filter_ctx[i].filter_graph)
+ continue;
+ ret = filter_encode_write_frame(NULL, i);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
+ goto end;
+ }
+
+ /* flush encoder */
+ ret = flush_encoder(i);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
+ goto end;
+ }
+ }
+
+ av_write_trailer(ofmt_ctx);
+end:
+ av_free_packet(&packet);
+ av_frame_free(&frame);
+ for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+ avcodec_close(ifmt_ctx->streams[i]->codec);
+ if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && ofmt_ctx->streams[i]->codec)
+ avcodec_close(ofmt_ctx->streams[i]->codec);
+ if (filter_ctx && filter_ctx[i].filter_graph)
+ avfilter_graph_free(&filter_ctx[i].filter_graph);
+ }
+ av_free(filter_ctx);
+ avformat_close_input(&ifmt_ctx);
+ if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))
+ avio_close(ofmt_ctx->pb);
+ avformat_free_context(ofmt_ctx);
+
+ if (ret < 0)
+ av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret));
+
+ return ret ? 1 : 0;
+}
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