#include <string.h>
#include <math.h>
+#include <libavutil/avassert.h>
+#include <libavutil/channel_layout.h>
#include <libavutil/opt.h>
#include <libavutil/mathematics.h>
#include <libavutil/timestamp.h>
#include <libswscale/swscale.h>
#include <libswresample/swresample.h>
-static int audio_is_eof, video_is_eof;
-
#define STREAM_DURATION 10.0
#define STREAM_FRAME_RATE 25 /* 25 images/s */
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
-static int sws_flags = SWS_BICUBIC;
+#define SCALE_FLAGS SWS_BICUBIC
+
+// a wrapper around a single output AVStream
+typedef struct OutputStream {
+ AVStream *st;
+
+ /* pts of the next frame that will be generated */
+ int64_t next_pts;
+ int samples_count;
+
+ AVFrame *frame;
+ AVFrame *tmp_frame;
+
+ float t, tincr, tincr2;
+
+ struct SwsContext *sws_ctx;
+ struct SwrContext *swr_ctx;
+} OutputStream;
static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)
{
static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt)
{
/* rescale output packet timestamp values from codec to stream timebase */
- pkt->pts = av_rescale_q_rnd(pkt->pts, *time_base, st->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
- pkt->dts = av_rescale_q_rnd(pkt->dts, *time_base, st->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
- pkt->duration = av_rescale_q(pkt->duration, *time_base, st->time_base);
+ av_packet_rescale_ts(pkt, *time_base, st->time_base);
pkt->stream_index = st->index;
/* Write the compressed frame to the media file. */
}
/* Add an output stream. */
-static AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,
- enum AVCodecID codec_id)
+static void add_stream(OutputStream *ost, AVFormatContext *oc,
+ AVCodec **codec,
+ enum AVCodecID codec_id)
{
AVCodecContext *c;
- AVStream *st;
+ int i;
/* find the encoder */
*codec = avcodec_find_encoder(codec_id);
exit(1);
}
- st = avformat_new_stream(oc, *codec);
- if (!st) {
+ ost->st = avformat_new_stream(oc, *codec);
+ if (!ost->st) {
fprintf(stderr, "Could not allocate stream\n");
exit(1);
}
- st->id = oc->nb_streams-1;
- c = st->codec;
+ ost->st->id = oc->nb_streams-1;
+ c = ost->st->codec;
switch ((*codec)->type) {
case AVMEDIA_TYPE_AUDIO:
(*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
c->bit_rate = 64000;
c->sample_rate = 44100;
- c->channels = 2;
+ if ((*codec)->supported_samplerates) {
+ c->sample_rate = (*codec)->supported_samplerates[0];
+ for (i = 0; (*codec)->supported_samplerates[i]; i++) {
+ if ((*codec)->supported_samplerates[i] == 44100)
+ c->sample_rate = 44100;
+ }
+ }
+ c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
+ c->channel_layout = AV_CH_LAYOUT_STEREO;
+ if ((*codec)->channel_layouts) {
+ c->channel_layout = (*codec)->channel_layouts[0];
+ for (i = 0; (*codec)->channel_layouts[i]; i++) {
+ if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO)
+ c->channel_layout = AV_CH_LAYOUT_STEREO;
+ }
+ }
+ c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
+ ost->st->time_base = (AVRational){ 1, c->sample_rate };
break;
case AVMEDIA_TYPE_VIDEO:
* of which frame timestamps are represented. For fixed-fps content,
* timebase should be 1/framerate and timestamp increments should be
* identical to 1. */
- c->time_base.den = STREAM_FRAME_RATE;
- c->time_base.num = 1;
+ ost->st->time_base = (AVRational){ 1, STREAM_FRAME_RATE };
+ c->time_base = ost->st->time_base;
+
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
c->pix_fmt = STREAM_PIX_FMT;
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
/* Some formats want stream headers to be separate. */
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
-
- return st;
}
/**************************************************************/
/* audio output */
-static float t, tincr, tincr2;
+static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt,
+ uint64_t channel_layout,
+ int sample_rate, int nb_samples)
+{
+ AVFrame *frame = av_frame_alloc();
+ int ret;
-AVFrame *audio_frame;
-static uint8_t **src_samples_data;
-static int src_samples_linesize;
-static int src_nb_samples;
+ if (!frame) {
+ fprintf(stderr, "Error allocating an audio frame\n");
+ exit(1);
+ }
-static int max_dst_nb_samples;
-uint8_t **dst_samples_data;
-int dst_samples_linesize;
-int dst_samples_size;
-int samples_count;
+ frame->format = sample_fmt;
+ frame->channel_layout = channel_layout;
+ frame->sample_rate = sample_rate;
+ frame->nb_samples = nb_samples;
+
+ if (nb_samples) {
+ ret = av_frame_get_buffer(frame, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Error allocating an audio buffer\n");
+ exit(1);
+ }
+ }
-struct SwrContext *swr_ctx = NULL;
+ return frame;
+}
-static void open_audio(AVFormatContext *oc, AVCodec *codec, AVStream *st)
+static void open_audio(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
{
AVCodecContext *c;
+ int nb_samples;
int ret;
+ AVDictionary *opt = NULL;
- c = st->codec;
-
- /* allocate and init a re-usable frame */
- audio_frame = av_frame_alloc();
- if (!audio_frame) {
- fprintf(stderr, "Could not allocate audio frame\n");
- exit(1);
- }
+ c = ost->st->codec;
/* open it */
- ret = avcodec_open2(c, codec, NULL);
+ av_dict_copy(&opt, opt_arg, 0);
+ ret = avcodec_open2(c, codec, &opt);
+ av_dict_free(&opt);
if (ret < 0) {
fprintf(stderr, "Could not open audio codec: %s\n", av_err2str(ret));
exit(1);
}
/* init signal generator */
- t = 0;
- tincr = 2 * M_PI * 110.0 / c->sample_rate;
+ ost->t = 0;
+ ost->tincr = 2 * M_PI * 110.0 / c->sample_rate;
/* increment frequency by 110 Hz per second */
- tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
+ ost->tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
- src_nb_samples = c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE ?
- 10000 : c->frame_size;
+ if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)
+ nb_samples = 10000;
+ else
+ nb_samples = c->frame_size;
- ret = av_samples_alloc_array_and_samples(&src_samples_data, &src_samples_linesize, c->channels,
- src_nb_samples, AV_SAMPLE_FMT_S16, 0);
- if (ret < 0) {
- fprintf(stderr, "Could not allocate source samples\n");
- exit(1);
- }
-
- /* compute the number of converted samples: buffering is avoided
- * ensuring that the output buffer will contain at least all the
- * converted input samples */
- max_dst_nb_samples = src_nb_samples;
+ ost->frame = alloc_audio_frame(c->sample_fmt, c->channel_layout,
+ c->sample_rate, nb_samples);
+ ost->tmp_frame = alloc_audio_frame(AV_SAMPLE_FMT_S16, c->channel_layout,
+ c->sample_rate, nb_samples);
/* create resampler context */
- if (c->sample_fmt != AV_SAMPLE_FMT_S16) {
- swr_ctx = swr_alloc();
- if (!swr_ctx) {
+ ost->swr_ctx = swr_alloc();
+ if (!ost->swr_ctx) {
fprintf(stderr, "Could not allocate resampler context\n");
exit(1);
}
/* set options */
- av_opt_set_int (swr_ctx, "in_channel_count", c->channels, 0);
- av_opt_set_int (swr_ctx, "in_sample_rate", c->sample_rate, 0);
- av_opt_set_sample_fmt(swr_ctx, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
- av_opt_set_int (swr_ctx, "out_channel_count", c->channels, 0);
- av_opt_set_int (swr_ctx, "out_sample_rate", c->sample_rate, 0);
- av_opt_set_sample_fmt(swr_ctx, "out_sample_fmt", c->sample_fmt, 0);
+ av_opt_set_int (ost->swr_ctx, "in_channel_count", c->channels, 0);
+ av_opt_set_int (ost->swr_ctx, "in_sample_rate", c->sample_rate, 0);
+ av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
+ av_opt_set_int (ost->swr_ctx, "out_channel_count", c->channels, 0);
+ av_opt_set_int (ost->swr_ctx, "out_sample_rate", c->sample_rate, 0);
+ av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt", c->sample_fmt, 0);
/* initialize the resampling context */
- if ((ret = swr_init(swr_ctx)) < 0) {
+ if ((ret = swr_init(ost->swr_ctx)) < 0) {
fprintf(stderr, "Failed to initialize the resampling context\n");
exit(1);
}
-
- ret = av_samples_alloc_array_and_samples(&dst_samples_data, &dst_samples_linesize, c->channels,
- max_dst_nb_samples, c->sample_fmt, 0);
- if (ret < 0) {
- fprintf(stderr, "Could not allocate destination samples\n");
- exit(1);
- }
- } else {
- dst_samples_data = src_samples_data;
- }
- dst_samples_size = av_samples_get_buffer_size(NULL, c->channels, max_dst_nb_samples,
- c->sample_fmt, 0);
}
/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
* 'nb_channels' channels. */
-static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
+static AVFrame *get_audio_frame(OutputStream *ost)
{
+ AVFrame *frame = ost->tmp_frame;
int j, i, v;
- int16_t *q;
+ int16_t *q = (int16_t*)frame->data[0];
+
+ /* check if we want to generate more frames */
+ if (av_compare_ts(ost->next_pts, ost->st->codec->time_base,
+ STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
+ return NULL;
- q = samples;
- for (j = 0; j < frame_size; j++) {
- v = (int)(sin(t) * 10000);
- for (i = 0; i < nb_channels; i++)
+ for (j = 0; j <frame->nb_samples; j++) {
+ v = (int)(sin(ost->t) * 10000);
+ for (i = 0; i < ost->st->codec->channels; i++)
*q++ = v;
- t += tincr;
- tincr += tincr2;
+ ost->t += ost->tincr;
+ ost->tincr += ost->tincr2;
}
+
+ frame->pts = ost->next_pts;
+ ost->next_pts += frame->nb_samples;
+
+ return frame;
}
-static void write_audio_frame(AVFormatContext *oc, AVStream *st, int flush)
+/*
+ * encode one audio frame and send it to the muxer
+ * return 1 when encoding is finished, 0 otherwise
+ */
+static int write_audio_frame(AVFormatContext *oc, OutputStream *ost)
{
AVCodecContext *c;
AVPacket pkt = { 0 }; // data and size must be 0;
- int got_packet, ret, dst_nb_samples;
+ AVFrame *frame;
+ int ret;
+ int got_packet;
+ int dst_nb_samples;
av_init_packet(&pkt);
- c = st->codec;
+ c = ost->st->codec;
- if (!flush) {
- get_audio_frame((int16_t *)src_samples_data[0], src_nb_samples, c->channels);
+ frame = get_audio_frame(ost);
+ if (frame) {
/* convert samples from native format to destination codec format, using the resampler */
- if (swr_ctx) {
/* compute destination number of samples */
- dst_nb_samples = av_rescale_rnd(swr_get_delay(swr_ctx, c->sample_rate) + src_nb_samples,
+ dst_nb_samples = av_rescale_rnd(swr_get_delay(ost->swr_ctx, c->sample_rate) + frame->nb_samples,
c->sample_rate, c->sample_rate, AV_ROUND_UP);
- if (dst_nb_samples > max_dst_nb_samples) {
- av_free(dst_samples_data[0]);
- ret = av_samples_alloc(dst_samples_data, &dst_samples_linesize, c->channels,
- dst_nb_samples, c->sample_fmt, 0);
- if (ret < 0)
- exit(1);
- max_dst_nb_samples = dst_nb_samples;
- dst_samples_size = av_samples_get_buffer_size(NULL, c->channels, dst_nb_samples,
- c->sample_fmt, 0);
- }
+ av_assert0(dst_nb_samples == frame->nb_samples);
+
+ /* when we pass a frame to the encoder, it may keep a reference to it
+ * internally;
+ * make sure we do not overwrite it here
+ */
+ ret = av_frame_make_writable(ost->frame);
+ if (ret < 0)
+ exit(1);
/* convert to destination format */
- ret = swr_convert(swr_ctx,
- dst_samples_data, dst_nb_samples,
- (const uint8_t **)src_samples_data, src_nb_samples);
+ ret = swr_convert(ost->swr_ctx,
+ ost->frame->data, dst_nb_samples,
+ (const uint8_t **)frame->data, frame->nb_samples);
if (ret < 0) {
fprintf(stderr, "Error while converting\n");
exit(1);
}
- } else {
- dst_nb_samples = src_nb_samples;
- }
+ frame = ost->frame;
- audio_frame->nb_samples = dst_nb_samples;
- audio_frame->pts = av_rescale_q(samples_count, (AVRational){1, c->sample_rate}, c->time_base);
- avcodec_fill_audio_frame(audio_frame, c->channels, c->sample_fmt,
- dst_samples_data[0], dst_samples_size, 0);
- samples_count += dst_nb_samples;
+ frame->pts = av_rescale_q(ost->samples_count, (AVRational){1, c->sample_rate}, c->time_base);
+ ost->samples_count += dst_nb_samples;
}
- ret = avcodec_encode_audio2(c, &pkt, flush ? NULL : audio_frame, &got_packet);
+ ret = avcodec_encode_audio2(c, &pkt, frame, &got_packet);
if (ret < 0) {
fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret));
exit(1);
}
- if (!got_packet) {
- if (flush)
- audio_is_eof = 1;
- return;
- }
-
- ret = write_frame(oc, &c->time_base, st, &pkt);
- if (ret < 0) {
- fprintf(stderr, "Error while writing audio frame: %s\n",
- av_err2str(ret));
- exit(1);
+ if (got_packet) {
+ ret = write_frame(oc, &c->time_base, ost->st, &pkt);
+ if (ret < 0) {
+ fprintf(stderr, "Error while writing audio frame: %s\n",
+ av_err2str(ret));
+ exit(1);
+ }
}
-}
-static void close_audio(AVFormatContext *oc, AVStream *st)
-{
- avcodec_close(st->codec);
- if (dst_samples_data != src_samples_data) {
- av_free(dst_samples_data[0]);
- av_free(dst_samples_data);
- }
- av_free(src_samples_data[0]);
- av_free(src_samples_data);
- av_frame_free(&audio_frame);
+ return (frame || got_packet) ? 0 : 1;
}
/**************************************************************/
/* video output */
-static AVFrame *frame;
-static AVPicture src_picture, dst_picture;
-static int frame_count;
+static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
+{
+ AVFrame *picture;
+ int ret;
+
+ picture = av_frame_alloc();
+ if (!picture)
+ return NULL;
+
+ picture->format = pix_fmt;
+ picture->width = width;
+ picture->height = height;
+
+ /* allocate the buffers for the frame data */
+ ret = av_frame_get_buffer(picture, 32);
+ if (ret < 0) {
+ fprintf(stderr, "Could not allocate frame data.\n");
+ exit(1);
+ }
+
+ return picture;
+}
-static void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st)
+static void open_video(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
{
int ret;
- AVCodecContext *c = st->codec;
+ AVCodecContext *c = ost->st->codec;
+ AVDictionary *opt = NULL;
+
+ av_dict_copy(&opt, opt_arg, 0);
/* open the codec */
- ret = avcodec_open2(c, codec, NULL);
+ ret = avcodec_open2(c, codec, &opt);
+ av_dict_free(&opt);
if (ret < 0) {
fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));
exit(1);
}
/* allocate and init a re-usable frame */
- frame = av_frame_alloc();
- if (!frame) {
+ ost->frame = alloc_picture(c->pix_fmt, c->width, c->height);
+ if (!ost->frame) {
fprintf(stderr, "Could not allocate video frame\n");
exit(1);
}
- frame->format = c->pix_fmt;
- frame->width = c->width;
- frame->height = c->height;
-
- /* Allocate the encoded raw picture. */
- ret = avpicture_alloc(&dst_picture, c->pix_fmt, c->width, c->height);
- if (ret < 0) {
- fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret));
- exit(1);
- }
/* If the output format is not YUV420P, then a temporary YUV420P
* picture is needed too. It is then converted to the required
* output format. */
+ ost->tmp_frame = NULL;
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
- ret = avpicture_alloc(&src_picture, AV_PIX_FMT_YUV420P, c->width, c->height);
- if (ret < 0) {
- fprintf(stderr, "Could not allocate temporary picture: %s\n",
- av_err2str(ret));
+ ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
+ if (!ost->tmp_frame) {
+ fprintf(stderr, "Could not allocate temporary picture\n");
exit(1);
}
}
-
- /* copy data and linesize picture pointers to frame */
- *((AVPicture *)frame) = dst_picture;
}
/* Prepare a dummy image. */
-static void fill_yuv_image(AVPicture *pict, int frame_index,
+static void fill_yuv_image(AVFrame *pict, int frame_index,
int width, int height)
{
- int x, y, i;
+ int x, y, i, ret;
+
+ /* when we pass a frame to the encoder, it may keep a reference to it
+ * internally;
+ * make sure we do not overwrite it here
+ */
+ ret = av_frame_make_writable(pict);
+ if (ret < 0)
+ exit(1);
i = frame_index;
}
}
-static void write_video_frame(AVFormatContext *oc, AVStream *st, int flush)
+static AVFrame *get_video_frame(OutputStream *ost)
{
- int ret;
- static struct SwsContext *sws_ctx;
- AVCodecContext *c = st->codec;
-
- if (!flush) {
- if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
- /* as we only generate a YUV420P picture, we must convert it
- * to the codec pixel format if needed */
- if (!sws_ctx) {
- sws_ctx = sws_getContext(c->width, c->height, AV_PIX_FMT_YUV420P,
- c->width, c->height, c->pix_fmt,
- sws_flags, NULL, NULL, NULL);
- if (!sws_ctx) {
- fprintf(stderr,
- "Could not initialize the conversion context\n");
- exit(1);
- }
+ AVCodecContext *c = ost->st->codec;
+
+ /* check if we want to generate more frames */
+ if (av_compare_ts(ost->next_pts, ost->st->codec->time_base,
+ STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
+ return NULL;
+
+ if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
+ /* as we only generate a YUV420P picture, we must convert it
+ * to the codec pixel format if needed */
+ if (!ost->sws_ctx) {
+ ost->sws_ctx = sws_getContext(c->width, c->height,
+ AV_PIX_FMT_YUV420P,
+ c->width, c->height,
+ c->pix_fmt,
+ SCALE_FLAGS, NULL, NULL, NULL);
+ if (!ost->sws_ctx) {
+ fprintf(stderr,
+ "Could not initialize the conversion context\n");
+ exit(1);
}
- fill_yuv_image(&src_picture, frame_count, c->width, c->height);
- sws_scale(sws_ctx,
- (const uint8_t * const *)src_picture.data, src_picture.linesize,
- 0, c->height, dst_picture.data, dst_picture.linesize);
- } else {
- fill_yuv_image(&dst_picture, frame_count, c->width, c->height);
}
+ fill_yuv_image(ost->tmp_frame, ost->next_pts, c->width, c->height);
+ sws_scale(ost->sws_ctx,
+ (const uint8_t * const *)ost->tmp_frame->data, ost->tmp_frame->linesize,
+ 0, c->height, ost->frame->data, ost->frame->linesize);
+ } else {
+ fill_yuv_image(ost->frame, ost->next_pts, c->width, c->height);
}
- if (oc->oformat->flags & AVFMT_RAWPICTURE && !flush) {
- /* Raw video case - directly store the picture in the packet */
+ ost->frame->pts = ost->next_pts++;
+
+ return ost->frame;
+}
+
+/*
+ * encode one video frame and send it to the muxer
+ * return 1 when encoding is finished, 0 otherwise
+ */
+static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
+{
+ int ret;
+ AVCodecContext *c;
+ AVFrame *frame;
+ int got_packet = 0;
+
+ c = ost->st->codec;
+
+ frame = get_video_frame(ost);
+
+ if (oc->oformat->flags & AVFMT_RAWPICTURE) {
+ /* a hack to avoid data copy with some raw video muxers */
AVPacket pkt;
av_init_packet(&pkt);
+ if (!frame)
+ return 1;
+
pkt.flags |= AV_PKT_FLAG_KEY;
- pkt.stream_index = st->index;
- pkt.data = dst_picture.data[0];
+ pkt.stream_index = ost->st->index;
+ pkt.data = (uint8_t *)frame;
pkt.size = sizeof(AVPicture);
+ pkt.pts = pkt.dts = frame->pts;
+ av_packet_rescale_ts(&pkt, c->time_base, ost->st->time_base);
+
ret = av_interleaved_write_frame(oc, &pkt);
} else {
AVPacket pkt = { 0 };
- int got_packet;
av_init_packet(&pkt);
/* encode the image */
- frame->pts = frame_count;
- ret = avcodec_encode_video2(c, &pkt, flush ? NULL : frame, &got_packet);
+ ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
if (ret < 0) {
fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
exit(1);
}
- /* If size is zero, it means the image was buffered. */
if (got_packet) {
- ret = write_frame(oc, &c->time_base, st, &pkt);
+ ret = write_frame(oc, &c->time_base, ost->st, &pkt);
} else {
- if (flush)
- video_is_eof = 1;
ret = 0;
}
}
fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
exit(1);
}
- frame_count++;
+
+ return (frame || got_packet) ? 0 : 1;
}
-static void close_video(AVFormatContext *oc, AVStream *st)
+static void close_stream(AVFormatContext *oc, OutputStream *ost)
{
- avcodec_close(st->codec);
- av_free(src_picture.data[0]);
- av_free(dst_picture.data[0]);
- av_frame_free(&frame);
+ avcodec_close(ost->st->codec);
+ av_frame_free(&ost->frame);
+ av_frame_free(&ost->tmp_frame);
+ sws_freeContext(ost->sws_ctx);
+ swr_free(&ost->swr_ctx);
}
/**************************************************************/
int main(int argc, char **argv)
{
+ OutputStream video_st = { 0 }, audio_st = { 0 };
const char *filename;
AVOutputFormat *fmt;
AVFormatContext *oc;
- AVStream *audio_st, *video_st;
AVCodec *audio_codec, *video_codec;
- double audio_time, video_time;
- int flush, ret;
+ int ret;
+ int have_video = 0, have_audio = 0;
+ int encode_video = 0, encode_audio = 0;
+ AVDictionary *opt = NULL;
/* Initialize libavcodec, and register all codecs and formats. */
av_register_all();
- if (argc != 2) {
+ if (argc < 2) {
printf("usage: %s output_file\n"
"API example program to output a media file with libavformat.\n"
"This program generates a synthetic audio and video stream, encodes and\n"
}
filename = argv[1];
+ if (argc > 3 && !strcmp(argv[2], "-flags")) {
+ av_dict_set(&opt, argv[2]+1, argv[3], 0);
+ }
/* allocate the output media context */
avformat_alloc_output_context2(&oc, NULL, NULL, filename);
/* Add the audio and video streams using the default format codecs
* and initialize the codecs. */
- video_st = NULL;
- audio_st = NULL;
-
- if (fmt->video_codec != AV_CODEC_ID_NONE)
- video_st = add_stream(oc, &video_codec, fmt->video_codec);
- if (fmt->audio_codec != AV_CODEC_ID_NONE)
- audio_st = add_stream(oc, &audio_codec, fmt->audio_codec);
+ if (fmt->video_codec != AV_CODEC_ID_NONE) {
+ add_stream(&video_st, oc, &video_codec, fmt->video_codec);
+ have_video = 1;
+ encode_video = 1;
+ }
+ if (fmt->audio_codec != AV_CODEC_ID_NONE) {
+ add_stream(&audio_st, oc, &audio_codec, fmt->audio_codec);
+ have_audio = 1;
+ encode_audio = 1;
+ }
/* Now that all the parameters are set, we can open the audio and
* video codecs and allocate the necessary encode buffers. */
- if (video_st)
- open_video(oc, video_codec, video_st);
- if (audio_st)
- open_audio(oc, audio_codec, audio_st);
+ if (have_video)
+ open_video(oc, video_codec, &video_st, opt);
+
+ if (have_audio)
+ open_audio(oc, audio_codec, &audio_st, opt);
av_dump_format(oc, 0, filename, 1);
}
/* Write the stream header, if any. */
- ret = avformat_write_header(oc, NULL);
+ ret = avformat_write_header(oc, &opt);
if (ret < 0) {
fprintf(stderr, "Error occurred when opening output file: %s\n",
av_err2str(ret));
return 1;
}
- flush = 0;
- while ((video_st && !video_is_eof) || (audio_st && !audio_is_eof)) {
- /* Compute current audio and video time. */
- audio_time = (audio_st && !audio_is_eof) ? audio_st->pts.val * av_q2d(audio_st->time_base) : INFINITY;
- video_time = (video_st && !video_is_eof) ? video_st->pts.val * av_q2d(video_st->time_base) : INFINITY;
-
- if (!flush &&
- (!audio_st || audio_time >= STREAM_DURATION) &&
- (!video_st || video_time >= STREAM_DURATION)) {
- flush = 1;
- }
-
- /* write interleaved audio and video frames */
- if (audio_st && !audio_is_eof && audio_time <= video_time) {
- write_audio_frame(oc, audio_st, flush);
- } else if (video_st && !video_is_eof && video_time < audio_time) {
- write_video_frame(oc, video_st, flush);
+ while (encode_video || encode_audio) {
+ /* select the stream to encode */
+ if (encode_video &&
+ (!encode_audio || av_compare_ts(video_st.next_pts, video_st.st->codec->time_base,
+ audio_st.next_pts, audio_st.st->codec->time_base) <= 0)) {
+ encode_video = !write_video_frame(oc, &video_st);
+ } else {
+ encode_audio = !write_audio_frame(oc, &audio_st);
}
}
av_write_trailer(oc);
/* Close each codec. */
- if (video_st)
- close_video(oc, video_st);
- if (audio_st)
- close_audio(oc, audio_st);
+ if (have_video)
+ close_stream(oc, &video_st);
+ if (have_audio)
+ close_stream(oc, &audio_st);
if (!(fmt->flags & AVFMT_NOFILE))
/* Close the output file. */
projects / platform / framework / web / crosswalk.git / blobdiff