| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | /** | ||
| 20 | * Decode one packet carrying AV_PKT_DATA_SKIP_SAMPLES and print how many | ||
| 21 | * samples are output, for skips at the start and padding at the end of the | ||
| 22 | * frame, alone, together and overlapping. | ||
| 23 | */ | ||
| 24 | |||
| 25 | #include <stdio.h> | ||
| 26 | #include <string.h> | ||
| 27 | |||
| 28 | #include "libavcodec/avcodec.h" | ||
| 29 | #include "libavutil/channel_layout.h" | ||
| 30 | #include "libavutil/intreadwrite.h" | ||
| 31 | #include "libavutil/macros.h" | ||
| 32 | |||
| 33 | #define FRAME_SAMPLES 1000 | ||
| 34 | |||
| 35 | 7 | static int decoded_samples(uint32_t skip, uint32_t discard) | |
| 36 | { | ||
| 37 | 7 | const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_PCM_S16LE); | |
| 38 | 7 | AVCodecContext *ctx = NULL; | |
| 39 | 7 | AVPacket *pkt = NULL; | |
| 40 | 7 | AVFrame *frame = NULL; | |
| 41 | uint8_t *side; | ||
| 42 | 7 | int nb_samples = 0; | |
| 43 | int ret; | ||
| 44 | |||
| 45 | 7 | ctx = avcodec_alloc_context3(codec); | |
| 46 | 7 | pkt = av_packet_alloc(); | |
| 47 | 7 | frame = av_frame_alloc(); | |
| 48 |
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7 | if (!ctx || !pkt || !frame) { |
| 49 | ✗ | ret = AVERROR(ENOMEM); | |
| 50 | ✗ | goto end; | |
| 51 | } | ||
| 52 | |||
| 53 | 7 | ctx->sample_rate = 48000; | |
| 54 | 7 | ctx->pkt_timebase = (AVRational){ 1, 48000 }; | |
| 55 | 7 | av_channel_layout_default(&ctx->ch_layout, 1); | |
| 56 | 7 | ret = avcodec_open2(ctx, codec, NULL); | |
| 57 |
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7 | if (ret < 0) |
| 58 | ✗ | goto end; | |
| 59 | |||
| 60 | 7 | ret = av_new_packet(pkt, FRAME_SAMPLES * 2); | |
| 61 |
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7 | if (ret < 0) |
| 62 | ✗ | goto end; | |
| 63 | 7 | memset(pkt->data, 0, pkt->size); | |
| 64 | 7 | pkt->pts = 0; | |
| 65 | 7 | side = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10); | |
| 66 |
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7 | if (!side) { |
| 67 | ✗ | ret = AVERROR(ENOMEM); | |
| 68 | ✗ | goto end; | |
| 69 | } | ||
| 70 | 7 | AV_WL32(side, skip); | |
| 71 | 7 | AV_WL32(side + 4, discard); | |
| 72 | |||
| 73 | 7 | ret = avcodec_send_packet(ctx, pkt); | |
| 74 |
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7 | if (ret < 0) |
| 75 | ✗ | goto end; | |
| 76 | 7 | ret = avcodec_send_packet(ctx, NULL); | |
| 77 |
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7 | if (ret < 0) |
| 78 | ✗ | goto end; | |
| 79 |
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12 | while ((ret = avcodec_receive_frame(ctx, frame)) >= 0) { |
| 80 | 5 | nb_samples += frame->nb_samples; | |
| 81 | 5 | av_frame_unref(frame); | |
| 82 | } | ||
| 83 |
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7 | ret = ret == AVERROR_EOF ? nb_samples : ret; |
| 84 | |||
| 85 | 7 | end: | |
| 86 | 7 | av_frame_free(&frame); | |
| 87 | 7 | av_packet_free(&pkt); | |
| 88 | 7 | avcodec_free_context(&ctx); | |
| 89 | 7 | return ret; | |
| 90 | } | ||
| 91 | |||
| 92 | 1 | int main(void) | |
| 93 | { | ||
| 94 | static const uint32_t cases[][2] = { | ||
| 95 | { 0, 0 }, | ||
| 96 | { 300, 0 }, | ||
| 97 | { 0, 400 }, | ||
| 98 | { 300, 400 }, | ||
| 99 | { 300, 700 }, | ||
| 100 | { 300, 800 }, | ||
| 101 | { 300, 1100 }, | ||
| 102 | }; | ||
| 103 | |||
| 104 |
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8 | for (int i = 0; i < FF_ARRAY_ELEMS(cases); i++) { |
| 105 | 7 | int ret = decoded_samples(cases[i][0], cases[i][1]); | |
| 106 |
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7 | if (ret < 0) { |
| 107 | ✗ | fprintf(stderr, "decoding failed: %s\n", av_err2str(ret)); | |
| 108 | ✗ | return 1; | |
| 109 | } | ||
| 110 | 7 | printf("frame %d skip %4"PRIu32" discard %4"PRIu32": %d samples\n", | |
| 111 | 7 | FRAME_SAMPLES, cases[i][0], cases[i][1], ret); | |
| 112 | } | ||
| 113 | 1 | return 0; | |
| 114 | } | ||
| 115 |