diff --git a/configure b/configure index 71a27347503c33aad3f9ff9ff9f67a59a27f60cf..a63169d115585e4f94d3b20fb7bc535ce91ae374 100755 --- a/configure +++ b/configure @@ -1462,9 +1462,10 @@ EXAMPLE_LIST=" avio_dir_cmd_example avio_reading_example decode_audio_example - decoding_encoding_example + decode_video_example demuxing_decoding_example encode_audio_example + encode_video_example extract_mvs_example filter_audio_example filtering_audio_example @@ -3170,9 +3171,10 @@ scale_vaapi_filter_deps="vaapi VAProcPipelineParameterBuffer" avio_dir_cmd_deps="avformat avutil" avio_reading_deps="avformat avcodec avutil" decode_audio_example_deps="avcodec avutil" -decoding_encoding_example_deps="avcodec avformat avutil" +decode_video_example_deps="avcodec avutil" demuxing_decoding_example_deps="avcodec avformat avutil" encode_audio_example_deps="avcodec avutil" +encode_video_example_deps="avcodec avutil" extract_mvs_example_deps="avcodec avformat avutil" filter_audio_example_deps="avfilter avutil" filtering_audio_example_deps="avfilter avcodec avformat avutil" diff --git a/doc/Makefile b/doc/Makefile index d76139a60b413ef83c67cb6b3116cffa00d8a355..c193fc3a6652dbfc931dc74cad34d92e0ebc184f 100644 --- a/doc/Makefile +++ b/doc/Makefile @@ -39,9 +39,10 @@ DOCS = $(DOCS-yes) DOC_EXAMPLES-$(CONFIG_AVIO_DIR_CMD_EXAMPLE) += avio_dir_cmd DOC_EXAMPLES-$(CONFIG_AVIO_READING_EXAMPLE) += avio_reading DOC_EXAMPLES-$(CONFIG_DECODE_AUDIO_EXAMPLE) += decode_audio -DOC_EXAMPLES-$(CONFIG_DECODING_ENCODING_EXAMPLE) += decoding_encoding +DOC_EXAMPLES-$(CONFIG_DECODE_VIDEO_EXAMPLE) += decode_video DOC_EXAMPLES-$(CONFIG_DEMUXING_DECODING_EXAMPLE) += demuxing_decoding DOC_EXAMPLES-$(CONFIG_ENCODE_AUDIO_EXAMPLE) += encode_audio +DOC_EXAMPLES-$(CONFIG_ENCODE_VIDEO_EXAMPLE) += encode_video DOC_EXAMPLES-$(CONFIG_EXTRACT_MVS_EXAMPLE) += extract_mvs DOC_EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio DOC_EXAMPLES-$(CONFIG_FILTERING_AUDIO_EXAMPLE) += filtering_audio diff --git a/doc/examples/.gitignore b/doc/examples/.gitignore index ee10e077683e2d0f446bfed44a222100749d514c..6bd9dc15088a1889ea256da4ebdea31b61394aee 100644 --- a/doc/examples/.gitignore +++ b/doc/examples/.gitignore @@ -1,9 +1,10 @@ /avio_dir_cmd /avio_reading /decode_audio -/decoding_encoding +/decode_video /demuxing_decoding /encode_audio +/encode_video /extract_mvs /filter_audio /filtering_audio diff --git a/doc/examples/Makefile b/doc/examples/Makefile index 3f33c22c16789f90c49670b14f52dd7cf4473cd9..2d0a3062c2d9d3427d0244ff415e8c8e233eb165 100644 --- a/doc/examples/Makefile +++ b/doc/examples/Makefile @@ -14,9 +14,10 @@ LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS) EXAMPLES= avio_dir_cmd \ avio_reading \ decode_audio \ - decoding_encoding \ + decode_video \ demuxing_decoding \ encode_audio \ + encode_video \ extract_mvs \ filtering_video \ filtering_audio \ diff --git a/doc/examples/decode_video.c b/doc/examples/decode_video.c new file mode 100644 index 0000000000000000000000000000000000000000..159765360f92bf6b8c7524c79a0b096d1e944a1a --- /dev/null +++ b/doc/examples/decode_video.c @@ -0,0 +1,182 @@ +/* + * Copyright (c) 2001 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 + * video decoding with libavcodec API example + * + * @example decode_video.c + */ + +#include +#include +#include + +#include + +#define INBUF_SIZE 4096 + +static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, + char *filename) +{ + FILE *f; + int i; + + f = fopen(filename,"w"); + fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255); + for (i = 0; i < ysize; i++) + fwrite(buf + i * wrap, 1, xsize, f); + fclose(f); +} + +static int decode_write_frame(const char *outfilename, AVCodecContext *avctx, + AVFrame *frame, int *frame_count, AVPacket *pkt, int last) +{ + int len, got_frame; + char buf[1024]; + + len = avcodec_decode_video2(avctx, frame, &got_frame, pkt); + if (len < 0) { + fprintf(stderr, "Error while decoding frame %d\n", *frame_count); + return len; + } + if (got_frame) { + printf("Saving %sframe %3d\n", last ? "last " : "", *frame_count); + fflush(stdout); + + /* the picture is allocated by the decoder, no need to free it */ + snprintf(buf, sizeof(buf), outfilename, *frame_count); + pgm_save(frame->data[0], frame->linesize[0], + frame->width, frame->height, buf); + (*frame_count)++; + } + if (pkt->data) { + pkt->size -= len; + pkt->data += len; + } + return 0; +} + +int main(int argc, char **argv) +{ + const char *filename, *outfilename; + AVCodec *codec; + AVCodecContext *c= NULL; + int frame_count; + FILE *f; + AVFrame *frame; + uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; + AVPacket avpkt; + + if (argc <= 2) { + fprintf(stderr, "Usage: %s \n", argv[0]); + exit(0); + } + filename = argv[1]; + outfilename = argv[2]; + + avcodec_register_all(); + + av_init_packet(&avpkt); + + /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */ + memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE); + + /* find the MPEG-1 video decoder */ + codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO); + if (!codec) { + fprintf(stderr, "Codec not found\n"); + exit(1); + } + + c = avcodec_alloc_context3(codec); + if (!c) { + fprintf(stderr, "Could not allocate video codec context\n"); + exit(1); + } + + if (codec->capabilities & AV_CODEC_CAP_TRUNCATED) + c->flags |= AV_CODEC_FLAG_TRUNCATED; // we do not send complete frames + + /* For some codecs, such as msmpeg4 and mpeg4, width and height + MUST be initialized there because this information is not + available in the bitstream. */ + + /* open it */ + if (avcodec_open2(c, codec, NULL) < 0) { + fprintf(stderr, "Could not open codec\n"); + exit(1); + } + + f = fopen(filename, "rb"); + if (!f) { + fprintf(stderr, "Could not open %s\n", filename); + exit(1); + } + + frame = av_frame_alloc(); + if (!frame) { + fprintf(stderr, "Could not allocate video frame\n"); + exit(1); + } + + frame_count = 0; + for (;;) { + avpkt.size = fread(inbuf, 1, INBUF_SIZE, f); + if (avpkt.size == 0) + break; + + /* NOTE1: some codecs are stream based (mpegvideo, mpegaudio) + and this is the only method to use them because you cannot + know the compressed data size before analysing it. + + BUT some other codecs (msmpeg4, mpeg4) are inherently frame + based, so you must call them with all the data for one + frame exactly. You must also initialize 'width' and + 'height' before initializing them. */ + + /* NOTE2: some codecs allow the raw parameters (frame size, + sample rate) to be changed at any frame. We handle this, so + you should also take care of it */ + + /* here, we use a stream based decoder (mpeg1video), so we + feed decoder and see if it could decode a frame */ + avpkt.data = inbuf; + while (avpkt.size > 0) + if (decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 0) < 0) + exit(1); + } + + /* Some codecs, such as MPEG, transmit the I- and P-frame with a + latency of one frame. You must do the following to have a + chance to get the last frame of the video. */ + avpkt.data = NULL; + avpkt.size = 0; + decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 1); + + fclose(f); + + avcodec_free_context(&c); + av_frame_free(&frame); + + return 0; +} diff --git a/doc/examples/decoding_encoding.c b/doc/examples/decoding_encoding.c deleted file mode 100644 index 7ee4f7743f39fcdae030d75ee0eee39a640e68fd..0000000000000000000000000000000000000000 --- a/doc/examples/decoding_encoding.c +++ /dev/null @@ -1,361 +0,0 @@ -/* - * Copyright (c) 2001 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 - * libavcodec API use example. - * - * @example decoding_encoding.c - * Note that libavcodec only handles codecs (MPEG, MPEG-4, etc...), - * not file formats (AVI, VOB, MP4, MOV, MKV, MXF, FLV, MPEG-TS, MPEG-PS, etc...). - * See library 'libavformat' for the format handling - */ - -#include - -#include -#include -#include -#include -#include -#include -#include - -#define INBUF_SIZE 4096 - -/* - * Video encoding example - */ -static void video_encode_example(const char *filename, int codec_id) -{ - AVCodec *codec; - AVCodecContext *c= NULL; - int i, ret, x, y, got_output; - FILE *f; - AVFrame *frame; - AVPacket pkt; - uint8_t endcode[] = { 0, 0, 1, 0xb7 }; - - printf("Encode video file %s\n", filename); - - /* find the video encoder */ - codec = avcodec_find_encoder(codec_id); - if (!codec) { - fprintf(stderr, "Codec not found\n"); - exit(1); - } - - c = avcodec_alloc_context3(codec); - if (!c) { - fprintf(stderr, "Could not allocate video codec context\n"); - exit(1); - } - - /* put sample parameters */ - c->bit_rate = 400000; - /* resolution must be a multiple of two */ - c->width = 352; - c->height = 288; - /* frames per second */ - c->time_base = (AVRational){1,25}; - /* emit one intra frame every ten frames - * check frame pict_type before passing frame - * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I - * then gop_size is ignored and the output of encoder - * will always be I frame irrespective to gop_size - */ - c->gop_size = 10; - c->max_b_frames = 1; - c->pix_fmt = AV_PIX_FMT_YUV420P; - - if (codec_id == AV_CODEC_ID_H264) - av_opt_set(c->priv_data, "preset", "slow", 0); - - /* open it */ - if (avcodec_open2(c, codec, NULL) < 0) { - fprintf(stderr, "Could not open codec\n"); - exit(1); - } - - f = fopen(filename, "wb"); - if (!f) { - fprintf(stderr, "Could not open %s\n", filename); - exit(1); - } - - frame = av_frame_alloc(); - if (!frame) { - fprintf(stderr, "Could not allocate video frame\n"); - exit(1); - } - frame->format = c->pix_fmt; - frame->width = c->width; - frame->height = c->height; - - /* the image can be allocated by any means and av_image_alloc() is - * just the most convenient way if av_malloc() is to be used */ - ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height, - c->pix_fmt, 32); - if (ret < 0) { - fprintf(stderr, "Could not allocate raw picture buffer\n"); - exit(1); - } - - /* encode 1 second of video */ - for (i = 0; i < 25; i++) { - av_init_packet(&pkt); - pkt.data = NULL; // packet data will be allocated by the encoder - pkt.size = 0; - - fflush(stdout); - /* prepare a dummy image */ - /* Y */ - for (y = 0; y < c->height; y++) { - for (x = 0; x < c->width; x++) { - frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3; - } - } - - /* Cb and Cr */ - for (y = 0; y < c->height/2; y++) { - for (x = 0; x < c->width/2; x++) { - frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2; - frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5; - } - } - - frame->pts = i; - - /* encode the image */ - ret = avcodec_encode_video2(c, &pkt, frame, &got_output); - if (ret < 0) { - fprintf(stderr, "Error encoding frame\n"); - exit(1); - } - - if (got_output) { - printf("Write frame %3d (size=%5d)\n", i, pkt.size); - fwrite(pkt.data, 1, pkt.size, f); - av_packet_unref(&pkt); - } - } - - /* get the delayed frames */ - for (got_output = 1; got_output; i++) { - fflush(stdout); - - ret = avcodec_encode_video2(c, &pkt, NULL, &got_output); - if (ret < 0) { - fprintf(stderr, "Error encoding frame\n"); - exit(1); - } - - if (got_output) { - printf("Write frame %3d (size=%5d)\n", i, pkt.size); - fwrite(pkt.data, 1, pkt.size, f); - av_packet_unref(&pkt); - } - } - - /* add sequence end code to have a real MPEG file */ - fwrite(endcode, 1, sizeof(endcode), f); - fclose(f); - - avcodec_free_context(&c); - av_freep(&frame->data[0]); - av_frame_free(&frame); - printf("\n"); -} - -/* - * Video decoding example - */ - -static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, - char *filename) -{ - FILE *f; - int i; - - f = fopen(filename,"w"); - fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255); - for (i = 0; i < ysize; i++) - fwrite(buf + i * wrap, 1, xsize, f); - fclose(f); -} - -static int decode_write_frame(const char *outfilename, AVCodecContext *avctx, - AVFrame *frame, int *frame_count, AVPacket *pkt, int last) -{ - int len, got_frame; - char buf[1024]; - - len = avcodec_decode_video2(avctx, frame, &got_frame, pkt); - if (len < 0) { - fprintf(stderr, "Error while decoding frame %d\n", *frame_count); - return len; - } - if (got_frame) { - printf("Saving %sframe %3d\n", last ? "last " : "", *frame_count); - fflush(stdout); - - /* the picture is allocated by the decoder, no need to free it */ - snprintf(buf, sizeof(buf), outfilename, *frame_count); - pgm_save(frame->data[0], frame->linesize[0], - frame->width, frame->height, buf); - (*frame_count)++; - } - if (pkt->data) { - pkt->size -= len; - pkt->data += len; - } - return 0; -} - -static void video_decode_example(const char *outfilename, const char *filename) -{ - AVCodec *codec; - AVCodecContext *c= NULL; - int frame_count; - FILE *f; - AVFrame *frame; - uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; - AVPacket avpkt; - - av_init_packet(&avpkt); - - /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */ - memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE); - - printf("Decode video file %s to %s\n", filename, outfilename); - - /* find the MPEG-1 video decoder */ - codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO); - if (!codec) { - fprintf(stderr, "Codec not found\n"); - exit(1); - } - - c = avcodec_alloc_context3(codec); - if (!c) { - fprintf(stderr, "Could not allocate video codec context\n"); - exit(1); - } - - if (codec->capabilities & AV_CODEC_CAP_TRUNCATED) - c->flags |= AV_CODEC_FLAG_TRUNCATED; // we do not send complete frames - - /* For some codecs, such as msmpeg4 and mpeg4, width and height - MUST be initialized there because this information is not - available in the bitstream. */ - - /* open it */ - if (avcodec_open2(c, codec, NULL) < 0) { - fprintf(stderr, "Could not open codec\n"); - exit(1); - } - - f = fopen(filename, "rb"); - if (!f) { - fprintf(stderr, "Could not open %s\n", filename); - exit(1); - } - - frame = av_frame_alloc(); - if (!frame) { - fprintf(stderr, "Could not allocate video frame\n"); - exit(1); - } - - frame_count = 0; - for (;;) { - avpkt.size = fread(inbuf, 1, INBUF_SIZE, f); - if (avpkt.size == 0) - break; - - /* NOTE1: some codecs are stream based (mpegvideo, mpegaudio) - and this is the only method to use them because you cannot - know the compressed data size before analysing it. - - BUT some other codecs (msmpeg4, mpeg4) are inherently frame - based, so you must call them with all the data for one - frame exactly. You must also initialize 'width' and - 'height' before initializing them. */ - - /* NOTE2: some codecs allow the raw parameters (frame size, - sample rate) to be changed at any frame. We handle this, so - you should also take care of it */ - - /* here, we use a stream based decoder (mpeg1video), so we - feed decoder and see if it could decode a frame */ - avpkt.data = inbuf; - while (avpkt.size > 0) - if (decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 0) < 0) - exit(1); - } - - /* Some codecs, such as MPEG, transmit the I- and P-frame with a - latency of one frame. You must do the following to have a - chance to get the last frame of the video. */ - avpkt.data = NULL; - avpkt.size = 0; - decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 1); - - fclose(f); - - avcodec_free_context(&c); - av_frame_free(&frame); - printf("\n"); -} - -int main(int argc, char **argv) -{ - const char *output_type; - - /* register all the codecs */ - avcodec_register_all(); - - if (argc < 2) { - printf("usage: %s output_type\n" - "API example program to decode/encode a media stream with libavcodec.\n" - "This program generates a synthetic stream and encodes it to a file\n" - "named test.h264, test.mp2 or test.mpg depending on output_type.\n" - "The encoded stream is then decoded and written to a raw data output.\n" - "output_type must be chosen between 'h264', 'mp2', 'mpg'.\n", - argv[0]); - return 1; - } - output_type = argv[1]; - - if (!strcmp(output_type, "h264")) { - video_encode_example("test.h264", AV_CODEC_ID_H264); - } else if (!strcmp(output_type, "mpg")) { - video_encode_example("test.mpg", AV_CODEC_ID_MPEG1VIDEO); - video_decode_example("test%02d.pgm", "test.mpg"); - } else { - fprintf(stderr, "Invalid output type '%s', choose between 'h264', 'mp2', or 'mpg'\n", - output_type); - return 1; - } - - return 0; -} diff --git a/doc/examples/encode_video.c b/doc/examples/encode_video.c new file mode 100644 index 0000000000000000000000000000000000000000..71c8c0bbee2f5d81ba6579502eeda19e3593aa4f --- /dev/null +++ b/doc/examples/encode_video.c @@ -0,0 +1,187 @@ +/* + * Copyright (c) 2001 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 + * video encoding with libavcodec API example + * + * @example encode_video.c + */ + +#include +#include +#include + +#include + +#include +#include + +int main(int argc, char **argv) +{ + const char *filename, *codec_name; + AVCodec *codec; + AVCodecContext *c= NULL; + int i, ret, x, y, got_output; + FILE *f; + AVFrame *frame; + AVPacket pkt; + uint8_t endcode[] = { 0, 0, 1, 0xb7 }; + + if (argc <= 2) { + fprintf(stderr, "Usage: %s \n", argv[0]); + exit(0); + } + filename = argv[1]; + codec_name = argv[2]; + + avcodec_register_all(); + + /* find the mpeg1video encoder */ + codec = avcodec_find_encoder_by_name(codec_name); + if (!codec) { + fprintf(stderr, "Codec not found\n"); + exit(1); + } + + c = avcodec_alloc_context3(codec); + if (!c) { + fprintf(stderr, "Could not allocate video codec context\n"); + exit(1); + } + + /* put sample parameters */ + c->bit_rate = 400000; + /* resolution must be a multiple of two */ + c->width = 352; + c->height = 288; + /* frames per second */ + c->time_base = (AVRational){1,25}; + /* emit one intra frame every ten frames + * check frame pict_type before passing frame + * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I + * then gop_size is ignored and the output of encoder + * will always be I frame irrespective to gop_size + */ + c->gop_size = 10; + c->max_b_frames = 1; + c->pix_fmt = AV_PIX_FMT_YUV420P; + + if (codec->id == AV_CODEC_ID_H264) + av_opt_set(c->priv_data, "preset", "slow", 0); + + /* open it */ + if (avcodec_open2(c, codec, NULL) < 0) { + fprintf(stderr, "Could not open codec\n"); + exit(1); + } + + f = fopen(filename, "wb"); + if (!f) { + fprintf(stderr, "Could not open %s\n", filename); + exit(1); + } + + frame = av_frame_alloc(); + if (!frame) { + fprintf(stderr, "Could not allocate video frame\n"); + exit(1); + } + frame->format = c->pix_fmt; + frame->width = c->width; + frame->height = c->height; + + /* the image can be allocated by any means and av_image_alloc() is + * just the most convenient way if av_malloc() is to be used */ + ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height, + c->pix_fmt, 32); + if (ret < 0) { + fprintf(stderr, "Could not allocate raw picture buffer\n"); + exit(1); + } + + /* encode 1 second of video */ + for (i = 0; i < 25; i++) { + av_init_packet(&pkt); + pkt.data = NULL; // packet data will be allocated by the encoder + pkt.size = 0; + + fflush(stdout); + /* prepare a dummy image */ + /* Y */ + for (y = 0; y < c->height; y++) { + for (x = 0; x < c->width; x++) { + frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3; + } + } + + /* Cb and Cr */ + for (y = 0; y < c->height/2; y++) { + for (x = 0; x < c->width/2; x++) { + frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2; + frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5; + } + } + + frame->pts = i; + + /* encode the image */ + ret = avcodec_encode_video2(c, &pkt, frame, &got_output); + if (ret < 0) { + fprintf(stderr, "Error encoding frame\n"); + exit(1); + } + + if (got_output) { + printf("Write frame %3d (size=%5d)\n", i, pkt.size); + fwrite(pkt.data, 1, pkt.size, f); + av_packet_unref(&pkt); + } + } + + /* get the delayed frames */ + for (got_output = 1; got_output; i++) { + fflush(stdout); + + ret = avcodec_encode_video2(c, &pkt, NULL, &got_output); + if (ret < 0) { + fprintf(stderr, "Error encoding frame\n"); + exit(1); + } + + if (got_output) { + printf("Write frame %3d (size=%5d)\n", i, pkt.size); + fwrite(pkt.data, 1, pkt.size, f); + av_packet_unref(&pkt); + } + } + + /* add sequence end code to have a real MPEG file */ + fwrite(endcode, 1, sizeof(endcode), f); + fclose(f); + + avcodec_free_context(&c); + av_freep(&frame->data[0]); + av_frame_free(&frame); + + return 0; +}