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Diffstat (limited to 'libavformat/output-example.c')
| -rw-r--r-- | libavformat/output-example.c | 527 |
1 files changed, 0 insertions, 527 deletions
diff --git a/libavformat/output-example.c b/libavformat/output-example.c deleted file mode 100644 index 496b7f8212..0000000000 --- a/libavformat/output-example.c +++ /dev/null @@ -1,527 +0,0 @@ -/* - * 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. - */ - -/** - * @file - * libavformat API example. - * - * @example libavformat/output-example.c - * Output a media file in any supported libavformat format. - * The default codecs are used. - */ - -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <math.h> - -#include "libavutil/mathematics.h" -#include "libavformat/avformat.h" -#include "libswscale/swscale.h" - -/* 5 seconds stream duration */ -#define STREAM_DURATION 5.0 -#define STREAM_FRAME_RATE 25 /* 25 images/s */ -#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE)) -#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */ - -static int sws_flags = SWS_BICUBIC; - -/**************************************************************/ -/* audio output */ - -static float t, tincr, tincr2; -static int16_t *samples; -static int audio_input_frame_size; - -/* - * add an audio output stream - */ -static AVStream *add_audio_stream(AVFormatContext *oc, enum AVCodecID codec_id) -{ - AVCodecContext *c; - AVStream *st; - AVCodec *codec; - - /* find the audio encoder */ - codec = avcodec_find_encoder(codec_id); - if (!codec) { - fprintf(stderr, "codec not found\n"); - exit(1); - } - - st = avformat_new_stream(oc, codec); - if (!st) { - fprintf(stderr, "Could not alloc stream\n"); - exit(1); - } - - c = st->codec; - - /* put sample parameters */ - c->sample_fmt = AV_SAMPLE_FMT_S16; - c->bit_rate = 64000; - c->sample_rate = 44100; - c->channels = 2; - - // some formats want stream headers to be separate - if (oc->oformat->flags & AVFMT_GLOBALHEADER) - c->flags |= CODEC_FLAG_GLOBAL_HEADER; - - return st; -} - -static void open_audio(AVFormatContext *oc, AVStream *st) -{ - AVCodecContext *c; - - c = st->codec; - - /* open it */ - if (avcodec_open2(c, NULL, NULL) < 0) { - fprintf(stderr, "could not open codec\n"); - exit(1); - } - - /* init signal generator */ - t = 0; - 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; - - if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE) - audio_input_frame_size = 10000; - else - audio_input_frame_size = c->frame_size; - samples = av_malloc(audio_input_frame_size * - av_get_bytes_per_sample(c->sample_fmt) * - c->channels); -} - -/* 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) -{ - int j, i, v; - int16_t *q; - - q = samples; - for (j = 0; j < frame_size; j++) { - v = (int)(sin(t) * 10000); - for (i = 0; i < nb_channels; i++) - *q++ = v; - t += tincr; - tincr += tincr2; - } -} - -static void write_audio_frame(AVFormatContext *oc, AVStream *st) -{ - AVCodecContext *c; - AVPacket pkt = { 0 }; // data and size must be 0; - AVFrame *frame = avcodec_alloc_frame(); - int got_packet; - - av_init_packet(&pkt); - c = st->codec; - - get_audio_frame(samples, audio_input_frame_size, c->channels); - frame->nb_samples = audio_input_frame_size; - avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt, - (uint8_t *)samples, - audio_input_frame_size * - av_get_bytes_per_sample(c->sample_fmt) * - c->channels, 1); - - avcodec_encode_audio2(c, &pkt, frame, &got_packet); - if (!got_packet) - return; - - pkt.stream_index = st->index; - - /* Write the compressed frame to the media file. */ - if (av_interleaved_write_frame(oc, &pkt) != 0) { - fprintf(stderr, "Error while writing audio frame\n"); - exit(1); - } - avcodec_free_frame(&frame); -} - -static void close_audio(AVFormatContext *oc, AVStream *st) -{ - avcodec_close(st->codec); - - av_free(samples); -} - -/**************************************************************/ -/* video output */ - -static AVFrame *picture, *tmp_picture; -static int frame_count; - -/* Add a video output stream. */ -static AVStream *add_video_stream(AVFormatContext *oc, enum AVCodecID codec_id) -{ - AVCodecContext *c; - AVStream *st; - AVCodec *codec; - - /* find the video encoder */ - codec = avcodec_find_encoder(codec_id); - if (!codec) { - fprintf(stderr, "codec not found\n"); - exit(1); - } - - st = avformat_new_stream(oc, codec); - if (!st) { - fprintf(stderr, "Could not alloc stream\n"); - exit(1); - } - - c = st->codec; - - /* Put sample parameters. */ - c->bit_rate = 400000; - /* Resolution must be a multiple of two. */ - c->width = 352; - c->height = 288; - /* timebase: 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 - * identical to 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; - if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) { - /* just for testing, we also add B frames */ - c->max_b_frames = 2; - } - if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) { - /* Needed to avoid using macroblocks in which some coeffs overflow. - * This does not happen with normal video, it just happens here as - * the motion of the chroma plane does not match the luma plane. */ - c->mb_decision = 2; - } - /* Some formats want stream headers to be separate. */ - if (oc->oformat->flags & AVFMT_GLOBALHEADER) - c->flags |= CODEC_FLAG_GLOBAL_HEADER; - - return st; -} - -static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height) -{ - AVFrame *picture; - uint8_t *picture_buf; - int size; - - picture = avcodec_alloc_frame(); - if (!picture) - return NULL; - size = avpicture_get_size(pix_fmt, width, height); - picture_buf = av_malloc(size); - if (!picture_buf) { - av_free(picture); - return NULL; - } - avpicture_fill((AVPicture *)picture, picture_buf, - pix_fmt, width, height); - return picture; -} - -static void open_video(AVFormatContext *oc, AVStream *st) -{ - AVCodecContext *c; - - c = st->codec; - - /* open the codec */ - if (avcodec_open2(c, NULL, NULL) < 0) { - fprintf(stderr, "could not open codec\n"); - exit(1); - } - - /* Allocate the encoded raw picture. */ - picture = alloc_picture(c->pix_fmt, c->width, c->height); - if (!picture) { - fprintf(stderr, "Could not allocate picture\n"); - 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. */ - tmp_picture = NULL; - if (c->pix_fmt != AV_PIX_FMT_YUV420P) { - tmp_picture = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height); - if (!tmp_picture) { - fprintf(stderr, "Could not allocate temporary picture\n"); - exit(1); - } - } -} - -/* Prepare a dummy image. */ -static void fill_yuv_image(AVFrame *pict, int frame_index, - int width, int height) -{ - int x, y, i; - - i = frame_index; - - /* Y */ - for (y = 0; y < height; y++) - for (x = 0; x < width; x++) - 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++) { - pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2; - pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5; - } - } -} - -static void write_video_frame(AVFormatContext *oc, AVStream *st) -{ - int ret; - AVCodecContext *c; - static struct SwsContext *img_convert_ctx; - - c = st->codec; - - if (frame_count >= STREAM_NB_FRAMES) { - /* No more frames to compress. The codec has a latency of a few - * frames if using B-frames, so we get the last frames by - * passing the same picture again. */ - } else { - 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 (img_convert_ctx == NULL) { - img_convert_ctx = sws_getContext(c->width, c->height, - AV_PIX_FMT_YUV420P, - c->width, c->height, - c->pix_fmt, - sws_flags, NULL, NULL, NULL); - if (img_convert_ctx == NULL) { - fprintf(stderr, - "Cannot initialize the conversion context\n"); - exit(1); - } - } - fill_yuv_image(tmp_picture, frame_count, c->width, c->height); - sws_scale(img_convert_ctx, tmp_picture->data, tmp_picture->linesize, - 0, c->height, picture->data, picture->linesize); - } else { - fill_yuv_image(picture, frame_count, c->width, c->height); - } - } - - if (oc->oformat->flags & AVFMT_RAWPICTURE) { - /* Raw video case - the API will change slightly in the near - * future for that. */ - AVPacket pkt; - av_init_packet(&pkt); - - pkt.flags |= AV_PKT_FLAG_KEY; - pkt.stream_index = st->index; - pkt.data = (uint8_t *)picture; - pkt.size = sizeof(AVPicture); - - ret = av_interleaved_write_frame(oc, &pkt); - } else { - AVPacket pkt = { 0 }; - int got_packet; - av_init_packet(&pkt); - - /* encode the image */ - ret = avcodec_encode_video2(c, &pkt, picture, &got_packet); - /* If size is zero, it means the image was buffered. */ - if (!ret && got_packet && pkt.size) { - if (pkt.pts != AV_NOPTS_VALUE) { - pkt.pts = av_rescale_q(pkt.pts, - c->time_base, st->time_base); - } - if (pkt.dts != AV_NOPTS_VALUE) { - pkt.dts = av_rescale_q(pkt.dts, - c->time_base, st->time_base); - } - pkt.stream_index = st->index; - - /* Write the compressed frame to the media file. */ - ret = av_interleaved_write_frame(oc, &pkt); - } else { - ret = 0; - } - } - if (ret != 0) { - fprintf(stderr, "Error while writing video frame\n"); - exit(1); - } - frame_count++; -} - -static void close_video(AVFormatContext *oc, AVStream *st) -{ - avcodec_close(st->codec); - av_free(picture->data[0]); - av_free(picture); - if (tmp_picture) { - av_free(tmp_picture->data[0]); - av_free(tmp_picture); - } -} - -/**************************************************************/ -/* media file output */ - -int main(int argc, char **argv) -{ - const char *filename; - AVOutputFormat *fmt; - AVFormatContext *oc; - AVStream *audio_st, *video_st; - double audio_pts, video_pts; - int i; - - /* 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" - "The output format is automatically guessed according to the file extension.\n" - "Raw images can also be output by using '%%d' in the filename\n" - "\n", argv[0]); - return 1; - } - - filename = argv[1]; - - /* Autodetect the output format from the name. default is MPEG. */ - fmt = av_guess_format(NULL, filename, NULL); - if (!fmt) { - printf("Could not deduce output format from file extension: using MPEG.\n"); - fmt = av_guess_format("mpeg", NULL, NULL); - } - if (!fmt) { - fprintf(stderr, "Could not find suitable output format\n"); - return 1; - } - - /* Allocate the output media context. */ - oc = avformat_alloc_context(); - if (!oc) { - fprintf(stderr, "Memory error\n"); - return 1; - } - oc->oformat = fmt; - snprintf(oc->filename, sizeof(oc->filename), "%s", 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_video_stream(oc, fmt->video_codec); - } - if (fmt->audio_codec != AV_CODEC_ID_NONE) { - audio_st = add_audio_stream(oc, fmt->audio_codec); - } - - /* 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_st); - if (audio_st) - open_audio(oc, audio_st); - - av_dump_format(oc, 0, filename, 1); - - /* open the output file, if needed */ - if (!(fmt->flags & AVFMT_NOFILE)) { - if (avio_open(&oc->pb, filename, AVIO_FLAG_WRITE) < 0) { - fprintf(stderr, "Could not open '%s'\n", filename); - return 1; - } - } - - /* Write the stream header, if any. */ - avformat_write_header(oc, NULL); - - 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) && - (!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); - } else { - write_video_frame(oc, video_st); - } - } - - /* Write the trailer, if any. The trailer must be written before you - * close the CodecContexts open when you wrote the header; otherwise - * av_write_trailer() may try to use memory that was freed on - * av_codec_close(). */ - av_write_trailer(oc); - - /* Close each codec. */ - if (video_st) - close_video(oc, video_st); - if (audio_st) - close_audio(oc, audio_st); - - /* Free the streams. */ - for (i = 0; i < oc->nb_streams; i++) { - av_freep(&oc->streams[i]->codec); - av_freep(&oc->streams[i]); - } - - if (!(fmt->flags & AVFMT_NOFILE)) - /* Close the output file. */ - avio_close(oc->pb); - - /* free the stream */ - av_free(oc); - - return 0; -} |