/*
* Libavformat API example: Output a media file in any supported
* libavformat format. The default codecs are used.
- *
+ *
* Copyright (c) 2003 Fabrice Bellard
- *
+ *
* 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.
+ * THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
int audio_outbuf_size;
int audio_input_frame_size;
-/*
+/*
* add an audio output stream
*/
-AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
+static AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
{
AVCodecContext *c;
AVStream *st;
exit(1);
}
- c = &st->codec;
+ c = st->codec;
c->codec_id = codec_id;
c->codec_type = CODEC_TYPE_AUDIO;
return st;
}
-void open_audio(AVFormatContext *oc, AVStream *st)
+static void open_audio(AVFormatContext *oc, AVStream *st)
{
AVCodecContext *c;
AVCodec *codec;
- c = &st->codec;
+ c = st->codec;
/* find the audio encoder */
codec = avcodec_find_encoder(c->codec_id);
support to compute the input frame size in samples */
if (c->frame_size <= 1) {
audio_input_frame_size = audio_outbuf_size / c->channels;
- switch(st->codec.codec_id) {
+ switch(st->codec->codec_id) {
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
'nb_channels' channels */
-void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
+static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
{
int j, i, v;
int16_t *q;
}
}
-void write_audio_frame(AVFormatContext *oc, AVStream *st)
+static void write_audio_frame(AVFormatContext *oc, AVStream *st)
{
AVCodecContext *c;
AVPacket pkt;
av_init_packet(&pkt);
-
- c = &st->codec;
+
+ c = st->codec;
get_audio_frame(samples, audio_input_frame_size, c->channels);
}
}
-void close_audio(AVFormatContext *oc, AVStream *st)
+static void close_audio(AVFormatContext *oc, AVStream *st)
{
- avcodec_close(&st->codec);
-
+ avcodec_close(st->codec);
+
av_free(samples);
av_free(audio_outbuf);
}
int frame_count, video_outbuf_size;
/* add a video output stream */
-AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
+static AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
{
AVCodecContext *c;
AVStream *st;
fprintf(stderr, "Could not alloc stream\n");
exit(1);
}
-
- c = &st->codec;
+
+ c = st->codec;
c->codec_id = codec_id;
c->codec_type = CODEC_TYPE_VIDEO;
/* put sample parameters */
c->bit_rate = 400000;
/* resolution must be a multiple of two */
- c->width = 352;
+ c->width = 352;
c->height = 288;
- /* frames per second */
- c->time_base.den = STREAM_FRAME_RATE;
+ /* time base: this is the fundamental unit of time (in seconds) in terms
+ of which frame timestamps are represented. for fixed-fps content,
+ timebase should be 1/framerate and timestamp increments should be
+ identically 1. */
+ c->time_base.den = STREAM_FRAME_RATE;
c->time_base.num = 1;
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
c->pix_fmt = STREAM_PIX_FMT;
c->max_b_frames = 2;
}
if (c->codec_id == CODEC_ID_MPEG1VIDEO){
- /* needed to avoid using macroblocks in which some coeffs overflow
- this doesnt happen with normal video, it just happens here as the
+ /* needed to avoid using macroblocks in which some coeffs overflow
+ this doesnt happen with normal video, it just happens here as the
motion of the chroma plane doesnt match the luma plane */
c->mb_decision=2;
}
// some formats want stream headers to be seperate
if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
-
+
return st;
}
-AVFrame *alloc_picture(int pix_fmt, int width, int height)
+static AVFrame *alloc_picture(int pix_fmt, int width, int height)
{
AVFrame *picture;
uint8_t *picture_buf;
int size;
-
+
picture = avcodec_alloc_frame();
if (!picture)
return NULL;
av_free(picture);
return NULL;
}
- avpicture_fill((AVPicture *)picture, picture_buf,
+ avpicture_fill((AVPicture *)picture, picture_buf,
pix_fmt, width, height);
return picture;
}
-
-void open_video(AVFormatContext *oc, AVStream *st)
+
+static void open_video(AVFormatContext *oc, AVStream *st)
{
AVCodec *codec;
AVCodecContext *c;
- c = &st->codec;
+ c = st->codec;
/* find the video encoder */
codec = avcodec_find_encoder(c->codec_id);
}
/* prepare a dummy image */
-void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
+static void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
{
int x, y, i;
pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
}
}
-
+
/* Cb and Cr */
for(y=0;y<height/2;y++) {
for(x=0;x<width/2;x++) {
}
}
-void write_video_frame(AVFormatContext *oc, AVStream *st)
+static void write_video_frame(AVFormatContext *oc, AVStream *st)
{
int out_size, ret;
AVCodecContext *c;
-
- c = &st->codec;
-
+
+ c = st->codec;
+
if (frame_count >= STREAM_NB_FRAMES) {
/* no more frame to compress. The codec has a latency of a few
frames if using B frames, so we get the last frames by
/* as we only generate a YUV420P picture, we must convert it
to the codec pixel format if needed */
fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
- img_convert((AVPicture *)picture, c->pix_fmt,
+ img_convert((AVPicture *)picture, c->pix_fmt,
(AVPicture *)tmp_picture, PIX_FMT_YUV420P,
c->width, c->height);
} else {
}
}
-
+
if (oc->oformat->flags & AVFMT_RAWPICTURE) {
/* raw video case. The API will change slightly in the near
futur for that */
AVPacket pkt;
av_init_packet(&pkt);
-
+
pkt.flags |= PKT_FLAG_KEY;
pkt.stream_index= st->index;
pkt.data= (uint8_t *)picture;
pkt.size= sizeof(AVPicture);
-
+
ret = av_write_frame(oc, &pkt);
} else {
/* encode the image */
out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
/* if zero size, it means the image was buffered */
- if (out_size != 0) {
+ if (out_size > 0) {
AVPacket pkt;
av_init_packet(&pkt);
-
+
pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
if(c->coded_frame->key_frame)
pkt.flags |= PKT_FLAG_KEY;
pkt.stream_index= st->index;
pkt.data= video_outbuf;
pkt.size= out_size;
-
+
/* write the compressed frame in the media file */
ret = av_write_frame(oc, &pkt);
} else {
frame_count++;
}
-void close_video(AVFormatContext *oc, AVStream *st)
+static void close_video(AVFormatContext *oc, AVStream *st)
{
- avcodec_close(&st->codec);
+ avcodec_close(st->codec);
av_free(picture->data[0]);
av_free(picture);
if (tmp_picture) {
/* initialize libavcodec, and register all codecs and formats */
av_register_all();
-
+
if (argc != 2) {
printf("usage: %s output_file\n"
"API example program to output a media file with libavformat.\n"
"\n", argv[0]);
exit(1);
}
-
+
filename = argv[1];
/* auto detect the output format from the name. default is
fprintf(stderr, "Could not find suitable output format\n");
exit(1);
}
-
+
/* allocate the output media context */
oc = av_alloc_format_context();
if (!oc) {
exit(1);
}
}
-
+
/* write the stream header, if any */
av_write_header(oc);
-
+
for(;;) {
/* compute current audio and video time */
if (audio_st)
audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
else
audio_pts = 0.0;
-
+
if (video_st)
video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
else
video_pts = 0.0;
- if ((!audio_st || audio_pts >= STREAM_DURATION) &&
+ if ((!audio_st || audio_pts >= STREAM_DURATION) &&
(!video_st || video_pts >= STREAM_DURATION))
break;
-
+
/* write interleaved audio and video frames */
if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
write_audio_frame(oc, audio_st);
/* write the trailer, if any */
av_write_trailer(oc);
-
+
/* free the streams */
for(i = 0; i < oc->nb_streams; i++) {
+ av_freep(&oc->streams[i]->codec);
av_freep(&oc->streams[i]);
}
projects / ffmpeg / blobdiff