使用FFmpeg新解碼API解封裝解碼音視訊(代碼執行個體)

在ffmpeg的源代碼中，有新舊版本的編解碼接口調用示例，但是demux、mux然後decode、encode的關聯起來的接口調用執行個體并沒有，在使用舊版本的編解碼接口在編譯時會報接口棄用告警資訊，是以最好盡快把原有的調用方式切換到新的編解碼接口調用方式，告警資訊如下：

點選(此處)折疊或打開

liuqideMBP:xxx liuqi$ make doc/examples/demuxing_decoding

CC doc/examples/demuxing_decoding.o

src/doc/examples/demuxing_decoding.c:73:15: warning: 'avcodec_decode_video2' is deprecated [-Wdeprecated-declarations]

        ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt);

              ^

src/libavcodec/avcodec.h:4631:1: note: 'avcodec_decode_video2' has been explicitly marked deprecated here

attribute_deprecated

^

src/libavutil/attributes.h:94:49: note: expanded from macro 'attribute_deprecated'

# define attribute_deprecated __attribute__((deprecated))

                                                ^

src/doc/examples/demuxing_decoding.c:111:15: warning: 'avcodec_decode_audio4' is deprecated [-Wdeprecated-declarations]

        ret = avcodec_decode_audio4(audio_dec_ctx, frame, got_frame, &pkt);

src/libavcodec/avcodec.h:4582:1: note: 'avcodec_decode_audio4' has been explicitly marked deprecated here

2 warnings generated.

LD doc/examples/demuxing_decoding_g

ld: warning: directory not found for option '-Llibavresample'

STRIP doc/examples/demuxing_decoding

為了修改友善，而網上又沒有隻管舉例的相關完整的執行個體，是以在這裡寫一個例子，供大夥參考

/*

 * Copyright (c) 2017 bbs.chinaffmpeg.com 孫悟空

 *

 * 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

 * Demuxing and decoding example.

 * Show how to use the libavformat and libavcodec API to demux and

 * decode audio and video data.

 * @example demuxing_decoding.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 int width, height;

static enum AVPixelFormat pix_fmt;

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 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;

/* Enable or disable frame reference counting. You are not supposed to support

 * both paths in your application but pick the one most appropriate to your

 * needs. Look for the use of refcount in this example to see what are the

 * differences of API usage between them. */

static int refcount = 0;

static int decode_packet(int *got_frame, int cached)

{

    int ret = 0;

    int i = 0;

    int ch = 0;

    int data_size = 0;

    int decoded = pkt.size;

    *got_frame = 0;

    if (pkt.stream_index == video_stream_idx) {

        /* decode video frame */

        ret = avcodec_send_packet(video_dec_ctx, &pkt);

        if (ret 0) {

            fprintf(stderr, "Error sending a packet for decoding\n");

            exit(1);

        }

        while (ret >= 0) {

            ret = avcodec_receive_frame(video_dec_ctx, frame);

            if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)

                return ret;

            else if (ret 0) {

                fprintf(stderr, "Error during decoding\n");

                exit(1);

            }

            printf("bbs.chinaffmpeg.com 孫悟空 video_frame%s n:%d coded_n:%d\n",

                   cached ? "(cached)" : "",

                   video_frame_count++, frame->coded_picture_number);

            /* 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,

                          pix_fmt, width, height);

            /* write to rawvideo file */

            fwrite(video_dst_data[0], 1, video_dst_bufsize, video_dst_file);

            printf("saving frame %3d\n", video_dec_ctx->frame_number);

            fflush(stdout);

    } else if (pkt.stream_index == audio_stream_idx) {

        /* decode audio frame */

#if 1

        /* send the packet with the compressed data to the decoder */

        ret = avcodec_send_packet(audio_dec_ctx, &pkt);

            fprintf(stderr, "Error submitting the packet to the decoder\n");

        /* read all the output frames (in general there may be any number of them */

            ret = avcodec_receive_frame(audio_dec_ctx, frame);

            data_size = av_get_bytes_per_sample(audio_dec_ctx->sample_fmt);

            if (data_size 0) {

                /* This should not occur, checking just for paranoia */

                fprintf(stderr, "Failed to calculate data size\n");

            for (i = 0; i frame->nb_samples; i++)

                for (ch = 0; ch audio_dec_ctx->channels; ch++)

                    fwrite(frame->data[ch] + data_size*i, 1, data_size, audio_dst_file);

        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));

#else

            fprintf(stderr, "Error decoding audio frame (%s)\n", av_err2str(ret));

            return ret;

        /* Some audio decoders decode only part of the packet, and have to be

         * called again with the remainder of the packet data.

         * Sample: 轉自bbs.chinaffmpeg.com 孫悟空fate-suite/lossless-audio/

         * luckynight-partial.shn

         * Also, some decoders might over-read the packet. */

        decoded = FFMIN(ret, pkt.size);

        if (*got_frame) {

            size_t unpadded_linesize = frame->nb_samples * av_get_bytes_per_sample(frame->format);

            printf("audio_frame%s n:%d nb_samples:%d pts:%s\n",

                   audio_frame_count++, frame->nb_samples,

                   av_ts2timestr(frame->pts, &audio_dec_ctx->time_base));

            /* Write the raw audio data samples of the first plane. This works

             * fine for packed formats (e.g. AV_SAMPLE_FMT_S16). However,

             * most audio decoders output planar audio, which uses a separate

             * plane of audio samples for each channel (e.g. AV_SAMPLE_FMT_S16P).

             * In other words, this code will write only the first audio channel

             * in these cases.

             * You should use libswresample or libavfilter to convert the frame

             * to packed data. */

            fwrite(frame->extended_data[0], 1, unpadded_linesize, audio_dst_file);

#endif

    }

    /* If we use frame reference counting, we own the data and need

     * to de-reference it when we don't use it anymore */

    if (*got_frame && refcount)

        av_frame_unref(frame);

    return decoded;

}

static int open_codec_context(int *stream_idx,

                              AVCodecContext **dec_ctx, AVFormatContext *fmt_ctx, enum AVMediaType type)

    int ret, stream_index;

    AVStream *st;

    AVCodec *dec = NULL;

    AVDictionary *opts = 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_index = ret;

        st = fmt_ctx->streams[stream_index];

        /* find decoder for the stream */

        dec = avcodec_find_decoder(st->codecpar->codec_id);

        if (!dec) {

            fprintf(stderr, "Failed to find %s codec\n",

                    av_get_media_type_string(type));

            return AVERROR(EINVAL);

        /* Allocate a codec context for the decoder */

        *dec_ctx = avcodec_alloc_context3(dec);

        if (!*dec_ctx) {

            fprintf(stderr, "Failed to allocate the %s codec context\n",

            return AVERROR(ENOMEM);

        /* Copy codec parameters from input stream to output codec context */

        if ((ret = avcodec_parameters_to_context(*dec_ctx, st->codecpar)) 0) {

            fprintf(stderr, "Failed to copy %s codec parameters to decoder context\n",

        /* Init the decoders, with or without reference counting */

        av_dict_set(&opts, "refcounted_frames", refcount ? "1" : "0", 0);

        if ((ret = avcodec_open2(*dec_ctx, dec, &opts)) 0) {

            fprintf(stderr, "Failed to open %s codec\n",

        *stream_idx = stream_index;

    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 && argc != 5) {

        fprintf(stderr, "usage: %s [-refcount] 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"

                "If the -refcount option is specified, the program use the\n"

                "reference counting frame system which allows keeping a copy of\n"

                "the data for longer than one decode call.\n"

                "\n", argv[0]);

        exit(1);

    if (argc == 5 && !strcmp(argv[1], "-refcount")) {

        refcount = 1;

        argv++;

    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);

    /* retrieve stream information */

    if (avformat_find_stream_info(fmt_ctx, NULL) 0) {

        fprintf(stderr, "Could not find stream information\n");

    if (open_codec_context(&video_stream_idx, &video_dec_ctx, fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) {

        video_stream = fmt_ctx->streams[video_stream_idx];

        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 */

        width = video_dec_ctx->width;

        height = video_dec_ctx->height;

        pix_fmt = video_dec_ctx->pix_fmt;

        ret = av_image_alloc(video_dst_data, video_dst_linesize,

                             width, height, pix_fmt, 1);

            fprintf(stderr, "Could not allocate raw video buffer\n");

        video_dst_bufsize = ret;

    if (open_codec_context(&audio_stream_idx, &audio_dec_ctx, fmt_ctx, AVMEDIA_TYPE_AUDIO) >= 0) {

        audio_stream = fmt_ctx->streams[audio_stream_idx];

        audio_dst_file = fopen(audio_dst_filename, "wb");

        if (!audio_dst_file) {

            fprintf(stderr, "Could not open destination file %s\n", audio_dst_filename);

    /* 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 = av_frame_alloc();

    if (!frame) {

        fprintf(stderr, "Could not allocate frame\n");

        ret = AVERROR(ENOMEM);

    /* 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) {

        AVPacket orig_pkt = pkt;

        do {

            ret = decode_packet(&got_frame, 0);

            if (ret 0)

                break;

            pkt.data += ret;

            pkt.size -= ret;

        } while (pkt.size > 0);

        av_packet_unref(&orig_pkt);

    /* flush cached frames */

    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(pix_fmt), width, height,

               video_dst_filename);

    if (audio_stream) {

        enum AVSampleFormat sfmt = audio_dec_ctx->sample_fmt;

        int n_channels = audio_dec_ctx->channels;

        const char *fmt;

        if (av_sample_fmt_is_planar(sfmt)) {

            const char *packed = av_get_sample_fmt_name(sfmt);

            printf("Warning: the sample format the decoder produced is planar "

                   "(%s). This example will output the first channel only.\n",

                   packed ? packed : "?");

            sfmt = av_get_packed_sample_fmt(sfmt);

            n_channels = 2;

        if ((ret = get_format_from_sample_fmt(&fmt, sfmt)) 0)

        printf("Play the output audio file with the command:\n"

               "ffplay -f %s -ac %d -ar %d %s\n",

               fmt, n_channels, audio_dec_ctx->sample_rate,

               audio_dst_filename);

end:

    avcodec_free_context(&video_dec_ctx);

    avcodec_free_context(&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_frame_free(&frame);

    av_free(video_dst_data[0]);

    return ret 0;

下面看一下編譯的方式，其實我是用的ffmpeg原生的編譯方式編譯的make doc/examples/demuxing_decoding，在這裡貼一下make -n doc/examples/demuxing_decoding的輸出

liuqideMBP:xxx liuqi$ make -n doc/examples/demuxing_decoding

printf "CC\t%s\n" doc/examples/demuxing_decoding.o; ccache gcc -I. -Isrc/ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/Users/liuqi/multimedia/ffmpeg/compat/dispatch_semaphore -DPIC -DZLIB_CONST -std=c11 -Werror=partial-availability -fomit-frame-pointer -fPIC -pthread -I/usr/local/include -I/usr/local/Cellar/fontconfig/2.12.6/include -I/usr/local/opt/freetype/include/freetype2 -I/usr/local/Cellar/fribidi/0.19.7_1/include/fribidi -I/usr/local/Cellar/glib/2.54.2/include/glib-2.0 -I/usr/local/Cellar/glib/2.54.2/lib/glib-2.0/include -I/usr/local/opt/gettext/include -I/usr/local/Cellar/pcre/8.41/include -I/usr/local/opt/freetype/include/freetype2 -I/usr/local/Cellar/libbluray/1.0.1/include -I/usr/local/include -I/usr/local/Cellar/fontconfig/2.12.6/include -I/usr/local/opt/freetype/include/freetype2 -I/usr/local/opt/freetype/include/freetype2 -I/usr/local/Cellar/speex/1.2rc1/include -I/usr/local/include -I/usr/local/Cellar/x265/2.5_1/include -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -Wno-unused-const-variable -O3 -fno-math-errno -fno-signed-zeros -mstack-alignment=16 -Qunused-arguments -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -D_THREAD_SAFE -I/usr/local/include/SDL2 -MMD -MF doc/examples/demuxing_decoding.d -MT doc/examples/demuxing_decoding.o -c -o doc/examples/demuxing_decoding.o src/doc/examples/demuxing_decoding.c

printf "LD\t%s\n" doc/examples/demuxing_decoding_g; ccache gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,-dynamic,-search_paths_first -Qunused-arguments -o doc/examples/demuxing_decoding_g doc/examples/demuxing_decoding.o -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswresample -lswscale -lavutil -framework Foundation -lm -framework AVFoundation -framework CoreVideo -framework CoreMedia -pthread -framework CoreGraphics -L/usr/local/lib -lSDL2 -framework OpenGL -framework OpenGL -pthread -lm -L/usr/local/lib -lass -framework CoreImage -framework AppKit -L/usr/local/Cellar/fontconfig/2.12.6/lib -L/usr/local/opt/freetype/lib -lfontconfig -lfreetype -L/usr/local/opt/freetype/lib -lfreetype -lm -lbz2 -L/usr/local/Cellar/libbluray/1.0.1/lib -lbluray -lz -Wl,-framework,CoreFoundation -Wl,-framework,Security -liconv -lm -llzma -lz -framework AudioToolbox -L/usr/local/lib -lfdk-aac -lmp3lame -L/usr/local/Cellar/speex/1.2rc1/lib -lspeex -L/usr/local/lib -lx264 -L/usr/local/Cellar/x265/2.5_1/lib -lx265 -pthread -framework VideoToolbox -framework CoreFoundation -framework CoreMedia -framework CoreVideo -framework CoreServices -lm -lm -lm -pthread -lm -framework VideoToolbox -framework CoreFoundation -framework CoreMedia -framework CoreVideo -framework CoreServices

printf "STRIP\t%s\n" doc/examples/demuxing_decoding; strip -x -o doc/examples/demuxing_decoding doc/examples/demuxing_decoding_g