mirror of https://git.ffmpeg.org/ffmpeg.git
suppressed memory leaks - added image conversion support if the codec does not support YUV420P - added raw output (any comments are welcome to simplify the API)
Originally committed as revision 2072 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
9f736ea256
commit
e70fcf075b
251
output_example.c
251
output_example.c
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@ -35,7 +35,7 @@
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/**************************************************************/
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/* audio output */
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float t, tincr;
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float t, tincr, tincr2;
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int16_t *samples;
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uint8_t *audio_outbuf;
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int audio_outbuf_size;
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@ -46,7 +46,6 @@ int audio_input_frame_size;
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*/
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AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
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{
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AVCodec *codec;
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AVCodecContext *c;
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AVStream *st;
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@ -56,19 +55,30 @@ AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
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exit(1);
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}
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/* find the MP2 encoder */
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codec = avcodec_find_encoder(codec_id);
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if (!codec) {
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fprintf(stderr, "codec not found\n");
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exit(1);
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}
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c = &st->codec;
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c->codec_id = codec_id;
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c->codec_type = CODEC_TYPE_AUDIO;
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/* put sample parameters */
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c->bit_rate = 64000;
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c->sample_rate = 44100;
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c->channels = 2;
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return st;
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}
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void open_audio(AVFormatContext *oc, AVStream *st)
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{
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AVCodecContext *c;
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AVCodec *codec;
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c = &st->codec;
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/* find the audio encoder */
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codec = avcodec_find_encoder(c->codec_id);
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if (!codec) {
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fprintf(stderr, "codec not found\n");
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exit(1);
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}
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/* open it */
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if (avcodec_open(c, codec) < 0) {
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@ -78,7 +88,9 @@ AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
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/* init signal generator */
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t = 0;
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tincr = 2 * M_PI * 440.0 / c->sample_rate;
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tincr = 2 * M_PI * 110.0 / c->sample_rate;
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/* increment frequency by 110 Hz per second */
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tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
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audio_outbuf_size = 10000;
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audio_outbuf = malloc(audio_outbuf_size);
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@ -101,8 +113,6 @@ AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
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audio_input_frame_size = c->frame_size;
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}
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samples = malloc(audio_input_frame_size * 2 * c->channels);
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return st;
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}
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void write_audio_frame(AVFormatContext *oc, AVStream *st)
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@ -117,6 +127,7 @@ void write_audio_frame(AVFormatContext *oc, AVStream *st)
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samples[2*j] = (int)(sin(t) * 10000);
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samples[2*j+1] = samples[2*j];
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t += tincr;
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tincr += tincr2;
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}
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out_size = avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
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@ -128,21 +139,26 @@ void write_audio_frame(AVFormatContext *oc, AVStream *st)
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}
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}
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void close_audio(AVFormatContext *oc, AVStream *st)
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{
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avcodec_close(&st->codec);
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av_free(samples);
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av_free(audio_outbuf);
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}
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/**************************************************************/
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/* video output */
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AVFrame *picture;
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AVFrame *picture, *tmp_picture;
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uint8_t *video_outbuf;
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int frame_count, video_outbuf_size;
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/* add a video output stream */
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AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
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{
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AVCodec *codec;
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AVCodecContext *c;
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AVStream *st;
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uint8_t *picture_buf;
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int size;
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st = av_new_stream(oc, 0);
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if (!st) {
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@ -150,14 +166,8 @@ AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
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exit(1);
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}
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/* find the mpeg1 video encoder */
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codec = avcodec_find_encoder(codec_id);
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if (!codec) {
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fprintf(stderr, "codec not found\n");
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exit(1);
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}
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c = &st->codec;
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c->codec_id = codec_id;
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c->codec_type = CODEC_TYPE_VIDEO;
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/* put sample parameters */
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@ -170,62 +180,148 @@ AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
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c->frame_rate_base= 1;
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c->gop_size = 12; /* emit one intra frame every twelve frames */
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/* open it */
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return st;
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}
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AVFrame *alloc_picture(int pix_fmt, int width, int height)
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{
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AVFrame *picture;
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uint8_t *picture_buf;
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int size;
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picture = avcodec_alloc_frame();
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if (!picture)
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return NULL;
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size = avpicture_get_size(pix_fmt, width, height);
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picture_buf = malloc(size);
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if (!picture_buf) {
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av_free(picture);
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return NULL;
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}
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avpicture_fill((AVPicture *)picture, picture_buf,
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pix_fmt, width, height);
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return picture;
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}
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void open_video(AVFormatContext *oc, AVStream *st)
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{
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AVCodec *codec;
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AVCodecContext *c;
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c = &st->codec;
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/* find the video encoder */
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codec = avcodec_find_encoder(c->codec_id);
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if (!codec) {
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fprintf(stderr, "codec not found\n");
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exit(1);
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}
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/* open the codec */
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if (avcodec_open(c, codec) < 0) {
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fprintf(stderr, "could not open codec\n");
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exit(1);
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}
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/* alloc various buffers */
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picture= avcodec_alloc_frame();
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video_outbuf_size = 100000;
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video_outbuf = malloc(video_outbuf_size);
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video_outbuf = NULL;
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if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
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/* allocate output buffer */
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/* XXX: API change will be done */
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video_outbuf_size = 200000;
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video_outbuf = malloc(video_outbuf_size);
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}
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size = c->width * c->height;
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picture_buf = malloc((size * 3) / 2); /* size for YUV 420 */
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picture->data[0] = picture_buf;
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picture->data[1] = picture->data[0] + size;
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picture->data[2] = picture->data[1] + size / 4;
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picture->linesize[0] = c->width;
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picture->linesize[1] = c->width / 2;
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picture->linesize[2] = c->width / 2;
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/* allocate the encoded raw picture */
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picture = alloc_picture(c->pix_fmt, c->width, c->height);
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if (!picture) {
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fprintf(stderr, "Could not allocate picture\n");
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exit(1);
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}
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return st;
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}
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/* if the output format is not YUV420P, then a temporary YUV420P
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picture is needed too. It is then converted to the required
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output format */
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tmp_picture = NULL;
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if (c->pix_fmt != PIX_FMT_YUV420P) {
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tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
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if (!tmp_picture) {
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fprintf(stderr, "Could not allocate temporary picture\n");
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exit(1);
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}
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}
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}
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void write_video_frame(AVFormatContext *oc, AVStream *st)
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/* prepare a dummy image */
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void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
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{
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int x, y, i, out_size;
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AVCodecContext *c;
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int x, y, i;
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i = frame_index;
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c = &st->codec;
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/* prepare a dummy image */
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/* Y */
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i = frame_count++;
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for(y=0;y<c->height;y++) {
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for(x=0;x<c->width;x++) {
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picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
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for(y=0;y<height;y++) {
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for(x=0;x<width;x++) {
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pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
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}
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}
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/* Cb and Cr */
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for(y=0;y<c->height/2;y++) {
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for(x=0;x<c->width/2;x++) {
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picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
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picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
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for(y=0;y<height/2;y++) {
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for(x=0;x<width/2;x++) {
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pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
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pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
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}
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}
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}
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/* encode the image */
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out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
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void write_video_frame(AVFormatContext *oc, AVStream *st)
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{
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int out_size, ret;
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AVCodecContext *c;
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/* write the compressed frame in the media file */
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if (av_write_frame(oc, st->index, video_outbuf, out_size) != 0) {
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c = &st->codec;
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if (c->pix_fmt != PIX_FMT_YUV420P) {
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/* as we only generate a YUV420P picture, we must convert it
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to the codec pixel format if needed */
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fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
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img_convert((AVPicture *)picture, c->pix_fmt,
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(AVPicture *)tmp_picture, PIX_FMT_YUV420P,
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c->width, c->height);
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} else {
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fill_yuv_image(picture, frame_count, c->width, c->height);
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}
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if (oc->oformat->flags & AVFMT_RAWPICTURE) {
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/* raw video case. The API will change slightly in the near
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futur for that */
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ret = av_write_frame(oc, st->index,
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(uint8_t *)picture, sizeof(AVPicture));
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} else {
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/* encode the image */
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out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
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/* write the compressed frame in the media file */
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ret = av_write_frame(oc, st->index, video_outbuf, out_size);
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}
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if (ret != 0) {
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fprintf(stderr, "Error while writing video frame\n");
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exit(1);
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}
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frame_count++;
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}
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void close_video(AVFormatContext *oc, AVStream *st)
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{
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avcodec_close(&st->codec);
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av_free(picture->data[0]);
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av_free(picture);
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if (tmp_picture) {
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av_free(tmp_picture->data[0]);
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av_free(tmp_picture);
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}
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av_free(video_outbuf);
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}
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/**************************************************************/
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@ -236,16 +332,18 @@ int main(int argc, char **argv)
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const char *filename;
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AVOutputFormat *fmt;
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AVFormatContext *oc;
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AVStream *st, *audio_st, *video_st;
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int i;
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AVStream *audio_st, *video_st;
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double audio_pts, video_pts;
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int i;
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/* initialize libavcodec, and register all codecs and formats */
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av_register_all();
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if (argc != 2) {
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printf("usage: %s output_file\n"
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"API example program for to output media file with libavformat\n"
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"API example program to output a media file with libavformat.\n"
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"The output format is automatically guessed according to the file extension.\n"
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"Raw images can also be output by using '%%d' in the filename\n"
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"\n", argv[0]);
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exit(1);
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}
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@ -271,6 +369,7 @@ int main(int argc, char **argv)
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exit(1);
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}
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oc->oformat = fmt;
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snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
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/* add the audio and video streams using the default format codecs
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and initialize the codecs */
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@ -283,8 +382,22 @@ int main(int argc, char **argv)
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audio_st = add_audio_stream(oc, fmt->audio_codec);
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}
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/* set the output parameters (must be done even if no
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parameters). */
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if (av_set_parameters(oc, NULL) < 0) {
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fprintf(stderr, "Invalid output format parameters\n");
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exit(1);
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}
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dump_format(oc, 0, filename, 1);
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/* now that all the parameters are set, we can open the audio and
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video codecs and allocate the necessary encode buffers */
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if (video_st)
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open_video(oc, video_st);
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if (audio_st)
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open_audio(oc, audio_st);
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/* open the output file, if needed */
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if (!(fmt->flags & AVFMT_NOFILE)) {
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if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
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@ -293,9 +406,6 @@ int main(int argc, char **argv)
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}
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}
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/* set the output parameters (must be done even if no parameters) */
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av_set_parameters(oc, NULL);
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/* write the stream header, if any */
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av_write_header(oc);
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@ -316,7 +426,7 @@ int main(int argc, char **argv)
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break;
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/* write interleaved audio and video frames */
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if (!video_st || (video_st && audio_pts < video_pts)) {
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if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
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write_audio_frame(oc, audio_st);
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} else {
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write_video_frame(oc, video_st);
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@ -324,14 +434,19 @@ int main(int argc, char **argv)
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}
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/* close each codec */
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for(i = 0;i < oc->nb_streams; i++) {
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st = oc->streams[i];
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avcodec_close(&st->codec);
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}
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if (video_st)
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close_video(oc, video_st);
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if (audio_st)
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close_audio(oc, audio_st);
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/* write the trailer, if any */
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av_write_trailer(oc);
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/* free the streams */
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for(i = 0; i < oc->nb_streams; i++) {
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av_freep(&oc->streams[i]);
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}
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if (!(fmt->flags & AVFMT_NOFILE)) {
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/* close the output file */
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url_fclose(&oc->pb);
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