| /* |
| * Copyright (c) 2012 Stefano Sabatini |
| * |
| * 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 demuxing API use example. |
| * |
| * Show how to use the libavformat and libavcodec API to demux and |
| * decode audio and video data. |
| * @example doc/examples/demuxing.c |
| */ |
| |
| #include <libavutil/imgutils.h> |
| #include <libavutil/samplefmt.h> |
| #include <libavutil/timestamp.h> |
| #include <libavformat/avformat.h> |
| |
| static AVFormatContext *fmt_ctx = NULL; |
| static AVCodecContext *video_dec_ctx = NULL, *audio_dec_ctx; |
| static AVStream *video_stream = NULL, *audio_stream = NULL; |
| static const char *src_filename = NULL; |
| static const char *video_dst_filename = NULL; |
| static const char *audio_dst_filename = NULL; |
| static FILE *video_dst_file = NULL; |
| static FILE *audio_dst_file = NULL; |
| |
| static uint8_t *video_dst_data[4] = {NULL}; |
| static int video_dst_linesize[4]; |
| static int video_dst_bufsize; |
| |
| static uint8_t **audio_dst_data = NULL; |
| static int audio_dst_linesize; |
| static int audio_dst_bufsize; |
| |
| static int video_stream_idx = -1, audio_stream_idx = -1; |
| static AVFrame *frame = NULL; |
| static AVPacket pkt; |
| static int video_frame_count = 0; |
| static int audio_frame_count = 0; |
| |
| static int decode_packet(int *got_frame, int cached) |
| { |
| int ret = 0; |
| |
| if (pkt.stream_index == video_stream_idx) { |
| /* decode video frame */ |
| ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt); |
| if (ret < 0) { |
| fprintf(stderr, "Error decoding video frame\n"); |
| return ret; |
| } |
| |
| if (*got_frame) { |
| printf("video_frame%s n:%d coded_n:%d pts:%s\n", |
| cached ? "(cached)" : "", |
| video_frame_count++, frame->coded_picture_number, |
| av_ts2timestr(frame->pts, &video_dec_ctx->time_base)); |
| |
| /* copy decoded frame to destination buffer: |
| * this is required since rawvideo expects non aligned data */ |
| av_image_copy(video_dst_data, video_dst_linesize, |
| (const uint8_t **)(frame->data), frame->linesize, |
| video_dec_ctx->pix_fmt, video_dec_ctx->width, video_dec_ctx->height); |
| |
| /* write to rawvideo file */ |
| fwrite(video_dst_data[0], 1, video_dst_bufsize, video_dst_file); |
| } |
| } else if (pkt.stream_index == audio_stream_idx) { |
| /* decode audio frame */ |
| ret = avcodec_decode_audio4(audio_dec_ctx, frame, got_frame, &pkt); |
| if (ret < 0) { |
| fprintf(stderr, "Error decoding audio frame\n"); |
| return ret; |
| } |
| |
| if (*got_frame) { |
| printf("audio_frame%s n:%d nb_samples:%d pts:%s\n", |
| cached ? "(cached)" : "", |
| audio_frame_count++, frame->nb_samples, |
| av_ts2timestr(frame->pts, &audio_dec_ctx->time_base)); |
| |
| ret = av_samples_alloc(audio_dst_data, &audio_dst_linesize, av_frame_get_channels(frame), |
| frame->nb_samples, frame->format, 1); |
| if (ret < 0) { |
| fprintf(stderr, "Could not allocate audio buffer\n"); |
| return AVERROR(ENOMEM); |
| } |
| |
| /* TODO: extend return code of the av_samples_* functions so that this call is not needed */ |
| audio_dst_bufsize = |
| av_samples_get_buffer_size(NULL, av_frame_get_channels(frame), |
| frame->nb_samples, frame->format, 1); |
| |
| /* copy audio data to destination buffer: |
| * this is required since rawaudio expects non aligned data */ |
| av_samples_copy(audio_dst_data, frame->data, 0, 0, |
| frame->nb_samples, av_frame_get_channels(frame), frame->format); |
| |
| /* write to rawaudio file */ |
| fwrite(audio_dst_data[0], 1, audio_dst_bufsize, audio_dst_file); |
| av_freep(&audio_dst_data[0]); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int open_codec_context(int *stream_idx, |
| AVFormatContext *fmt_ctx, enum AVMediaType type) |
| { |
| int ret; |
| AVStream *st; |
| AVCodecContext *dec_ctx = NULL; |
| AVCodec *dec = NULL; |
| |
| ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Could not find %s stream in input file '%s'\n", |
| av_get_media_type_string(type), src_filename); |
| return ret; |
| } else { |
| *stream_idx = ret; |
| st = fmt_ctx->streams[*stream_idx]; |
| |
| /* find decoder for the stream */ |
| dec_ctx = st->codec; |
| dec = avcodec_find_decoder(dec_ctx->codec_id); |
| if (!dec) { |
| fprintf(stderr, "Failed to find %s codec\n", |
| av_get_media_type_string(type)); |
| return ret; |
| } |
| |
| if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0) { |
| fprintf(stderr, "Failed to open %s codec\n", |
| av_get_media_type_string(type)); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int get_format_from_sample_fmt(const char **fmt, |
| enum AVSampleFormat sample_fmt) |
| { |
| int i; |
| struct sample_fmt_entry { |
| enum AVSampleFormat sample_fmt; const char *fmt_be, *fmt_le; |
| } sample_fmt_entries[] = { |
| { AV_SAMPLE_FMT_U8, "u8", "u8" }, |
| { AV_SAMPLE_FMT_S16, "s16be", "s16le" }, |
| { AV_SAMPLE_FMT_S32, "s32be", "s32le" }, |
| { AV_SAMPLE_FMT_FLT, "f32be", "f32le" }, |
| { AV_SAMPLE_FMT_DBL, "f64be", "f64le" }, |
| }; |
| *fmt = NULL; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(sample_fmt_entries); i++) { |
| struct sample_fmt_entry *entry = &sample_fmt_entries[i]; |
| if (sample_fmt == entry->sample_fmt) { |
| *fmt = AV_NE(entry->fmt_be, entry->fmt_le); |
| return 0; |
| } |
| } |
| |
| fprintf(stderr, |
| "sample format %s is not supported as output format\n", |
| av_get_sample_fmt_name(sample_fmt)); |
| return -1; |
| } |
| |
| int main (int argc, char **argv) |
| { |
| int ret = 0, got_frame; |
| |
| if (argc != 4) { |
| fprintf(stderr, "usage: %s input_file video_output_file audio_output_file\n" |
| "API example program to show how to read frames from an input file.\n" |
| "This program reads frames from a file, decodes them, and writes decoded\n" |
| "video frames to a rawvideo file named video_output_file, and decoded\n" |
| "audio frames to a rawaudio file named audio_output_file.\n" |
| "\n", argv[0]); |
| exit(1); |
| } |
| src_filename = argv[1]; |
| video_dst_filename = argv[2]; |
| audio_dst_filename = argv[3]; |
| |
| /* register all formats and codecs */ |
| av_register_all(); |
| |
| /* open input file, and allocate format context */ |
| if (avformat_open_input(&fmt_ctx, src_filename, NULL, NULL) < 0) { |
| fprintf(stderr, "Could not open source file %s\n", src_filename); |
| exit(1); |
| } |
| |
| /* retrieve stream information */ |
| if (avformat_find_stream_info(fmt_ctx, NULL) < 0) { |
| fprintf(stderr, "Could not find stream information\n"); |
| exit(1); |
| } |
| |
| if (open_codec_context(&video_stream_idx, fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) { |
| video_stream = fmt_ctx->streams[video_stream_idx]; |
| video_dec_ctx = video_stream->codec; |
| |
| video_dst_file = fopen(video_dst_filename, "wb"); |
| if (!video_dst_file) { |
| fprintf(stderr, "Could not open destination file %s\n", video_dst_filename); |
| ret = 1; |
| goto end; |
| } |
| |
| /* allocate image where the decoded image will be put */ |
| ret = av_image_alloc(video_dst_data, video_dst_linesize, |
| video_dec_ctx->width, video_dec_ctx->height, |
| video_dec_ctx->pix_fmt, 1); |
| if (ret < 0) { |
| fprintf(stderr, "Could not allocate raw video buffer\n"); |
| goto end; |
| } |
| video_dst_bufsize = ret; |
| } |
| |
| if (open_codec_context(&audio_stream_idx, fmt_ctx, AVMEDIA_TYPE_AUDIO) >= 0) { |
| int nb_planes; |
| |
| audio_stream = fmt_ctx->streams[audio_stream_idx]; |
| audio_dec_ctx = audio_stream->codec; |
| audio_dst_file = fopen(audio_dst_filename, "wb"); |
| if (!audio_dst_file) { |
| fprintf(stderr, "Could not open destination file %s\n", video_dst_filename); |
| ret = 1; |
| goto end; |
| } |
| |
| nb_planes = av_sample_fmt_is_planar(audio_dec_ctx->sample_fmt) ? |
| audio_dec_ctx->channels : 1; |
| audio_dst_data = av_mallocz(sizeof(uint8_t *) * nb_planes); |
| if (!audio_dst_data) { |
| fprintf(stderr, "Could not allocate audio data buffers\n"); |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| } |
| |
| /* dump input information to stderr */ |
| av_dump_format(fmt_ctx, 0, src_filename, 0); |
| |
| if (!audio_stream && !video_stream) { |
| fprintf(stderr, "Could not find audio or video stream in the input, aborting\n"); |
| ret = 1; |
| goto end; |
| } |
| |
| frame = avcodec_alloc_frame(); |
| if (!frame) { |
| fprintf(stderr, "Could not allocate frame\n"); |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| |
| /* initialize packet, set data to NULL, let the demuxer fill it */ |
| av_init_packet(&pkt); |
| pkt.data = NULL; |
| pkt.size = 0; |
| |
| if (video_stream) |
| printf("Demuxing video from file '%s' into '%s'\n", src_filename, video_dst_filename); |
| if (audio_stream) |
| printf("Demuxing audio from file '%s' into '%s'\n", src_filename, audio_dst_filename); |
| |
| /* read frames from the file */ |
| while (av_read_frame(fmt_ctx, &pkt) >= 0) { |
| decode_packet(&got_frame, 0); |
| av_free_packet(&pkt); |
| } |
| |
| /* flush cached frames */ |
| pkt.data = NULL; |
| pkt.size = 0; |
| do { |
| decode_packet(&got_frame, 1); |
| } while (got_frame); |
| |
| printf("Demuxing succeeded.\n"); |
| |
| if (video_stream) { |
| printf("Play the output video file with the command:\n" |
| "ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n", |
| av_get_pix_fmt_name(video_dec_ctx->pix_fmt), video_dec_ctx->width, video_dec_ctx->height, |
| video_dst_filename); |
| } |
| |
| if (audio_stream) { |
| const char *fmt; |
| |
| if ((ret = get_format_from_sample_fmt(&fmt, audio_dec_ctx->sample_fmt)) < 0) |
| goto end; |
| printf("Play the output audio file with the command:\n" |
| "ffplay -f %s -ac %d -ar %d %s\n", |
| fmt, audio_dec_ctx->channels, audio_dec_ctx->sample_rate, |
| audio_dst_filename); |
| } |
| |
| end: |
| if (video_dec_ctx) |
| avcodec_close(video_dec_ctx); |
| if (audio_dec_ctx) |
| avcodec_close(audio_dec_ctx); |
| avformat_close_input(&fmt_ctx); |
| if (video_dst_file) |
| fclose(video_dst_file); |
| if (audio_dst_file) |
| fclose(audio_dst_file); |
| av_free(frame); |
| av_free(video_dst_data[0]); |
| av_free(audio_dst_data); |
| |
| return ret < 0; |
| } |