1/*
2 * Copyright (c) 2015 Ludmila Glinskih
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 * THE SOFTWARE.
22 */
23
24/*
25 * FLAC codec test.
26 * Encodes raw data to FLAC format and decodes it back to raw. Compares raw-data
27 * after that.
28 */
29
30#include "libavcodec/avcodec.h"
31#include "libavutil/channel_layout.h"
32#include "libavutil/common.h"
33#include "libavutil/samplefmt.h"
34
35#define NUMBER_OF_AUDIO_FRAMES 200
36#define NAME_BUFF_SIZE 100
37
38/* generate i-th frame of test audio */
39static int generate_raw_frame(uint16_t *frame_data, int i, int sample_rate,
40                              int channels, int frame_size)
41{
42    int j, k;
43
44    for (j = 0; j < frame_size; j++) {
45        frame_data[channels * j] = 10000 * ((j / 10 * i) % 2);
46        for (k = 1; k < channels; k++)
47            frame_data[channels * j + k] = frame_data[channels * j] * (k + 1);
48    }
49    return 0;
50}
51
52static int init_encoder(const AVCodec *enc, AVCodecContext **enc_ctx,
53                        const AVChannelLayout *ch_layout, int sample_rate)
54{
55    AVCodecContext *ctx;
56    int result;
57    char name_buff[NAME_BUFF_SIZE];
58
59    av_channel_layout_describe(ch_layout, name_buff, NAME_BUFF_SIZE);
60    av_log(NULL, AV_LOG_INFO, "channel layout: %s, sample rate: %i\n", name_buff, sample_rate);
61
62    ctx = avcodec_alloc_context3(enc);
63    if (!ctx) {
64        av_log(NULL, AV_LOG_ERROR, "Can't allocate encoder context\n");
65        return AVERROR(ENOMEM);
66    }
67
68    ctx->sample_fmt = AV_SAMPLE_FMT_S16;
69    ctx->sample_rate = sample_rate;
70    av_channel_layout_copy(&ctx->ch_layout, ch_layout);
71
72    result = avcodec_open2(ctx, enc, NULL);
73    if (result < 0) {
74        av_log(ctx, AV_LOG_ERROR, "Can't open encoder\n");
75        return result;
76    }
77
78    *enc_ctx = ctx;
79    return 0;
80}
81
82static int init_decoder(const AVCodec *dec, AVCodecContext **dec_ctx,
83                        const AVChannelLayout *ch_layout)
84{
85    AVCodecContext *ctx;
86    int result;
87
88    ctx = avcodec_alloc_context3(dec);
89    if (!ctx) {
90        av_log(NULL, AV_LOG_ERROR , "Can't allocate decoder context\n");
91        return AVERROR(ENOMEM);
92    }
93
94    ctx->request_sample_fmt = AV_SAMPLE_FMT_S16;
95    av_channel_layout_copy(&ctx->ch_layout, ch_layout);
96
97    result = avcodec_open2(ctx, dec, NULL);
98    if (result < 0) {
99        av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
100        return result;
101    }
102
103    *dec_ctx = ctx;
104    return 0;
105}
106
107static int run_test(const AVCodec *enc, const AVCodec *dec,
108                    AVCodecContext *enc_ctx, AVCodecContext *dec_ctx)
109{
110    AVPacket *enc_pkt;
111    AVFrame *in_frame, *out_frame;
112    uint8_t *raw_in = NULL, *raw_out = NULL;
113    int in_offset = 0, out_offset = 0;
114    int result = 0;
115    int i = 0;
116    int in_frame_bytes, out_frame_bytes;
117
118    enc_pkt = av_packet_alloc();
119    if (!enc_pkt) {
120        av_log(NULL, AV_LOG_ERROR, "Can't allocate output packet\n");
121        return AVERROR(ENOMEM);
122    }
123
124    in_frame = av_frame_alloc();
125    if (!in_frame) {
126        av_log(NULL, AV_LOG_ERROR, "Can't allocate input frame\n");
127        return AVERROR(ENOMEM);
128    }
129
130    in_frame->nb_samples = enc_ctx->frame_size;
131    in_frame->format = enc_ctx->sample_fmt;
132    result = av_channel_layout_copy(&in_frame->ch_layout, &enc_ctx->ch_layout);
133    if (result < 0)
134        return result;
135    if (av_frame_get_buffer(in_frame, 0) != 0) {
136        av_log(NULL, AV_LOG_ERROR, "Can't allocate a buffer for input frame\n");
137        return AVERROR(ENOMEM);
138    }
139
140    out_frame = av_frame_alloc();
141    if (!out_frame) {
142        av_log(NULL, AV_LOG_ERROR, "Can't allocate output frame\n");
143        return AVERROR(ENOMEM);
144    }
145
146    raw_in = av_malloc(in_frame->linesize[0] * NUMBER_OF_AUDIO_FRAMES);
147    if (!raw_in) {
148        av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_in\n");
149        return AVERROR(ENOMEM);
150    }
151
152    raw_out = av_malloc(in_frame->linesize[0] * NUMBER_OF_AUDIO_FRAMES);
153    if (!raw_out) {
154        av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_out\n");
155        return AVERROR(ENOMEM);
156    }
157
158    for (i = 0; i < NUMBER_OF_AUDIO_FRAMES; i++) {
159        result = av_frame_make_writable(in_frame);
160        if (result < 0)
161            return result;
162
163        generate_raw_frame((uint16_t*)(in_frame->data[0]), i, enc_ctx->sample_rate,
164                           enc_ctx->ch_layout.nb_channels, enc_ctx->frame_size);
165        in_frame_bytes = in_frame->nb_samples * in_frame->ch_layout.nb_channels * sizeof(uint16_t);
166        if (in_frame_bytes > in_frame->linesize[0]) {
167            av_log(NULL, AV_LOG_ERROR, "Incorrect value of input frame linesize\n");
168            return 1;
169        }
170        memcpy(raw_in + in_offset, in_frame->data[0], in_frame_bytes);
171        in_offset += in_frame_bytes;
172        result = avcodec_send_frame(enc_ctx, in_frame);
173        if (result < 0) {
174            av_log(NULL, AV_LOG_ERROR, "Error submitting a frame for encoding\n");
175            return result;
176        }
177
178        while (result >= 0) {
179            result = avcodec_receive_packet(enc_ctx, enc_pkt);
180            if (result == AVERROR(EAGAIN))
181                break;
182            else if (result < 0 && result != AVERROR_EOF) {
183                av_log(NULL, AV_LOG_ERROR, "Error encoding audio frame\n");
184                return result;
185            }
186
187            /* if we get an encoded packet, feed it straight to the decoder */
188            result = avcodec_send_packet(dec_ctx, enc_pkt);
189            av_packet_unref(enc_pkt);
190            if (result < 0) {
191                av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
192                return result;
193            }
194
195            result = avcodec_receive_frame(dec_ctx, out_frame);
196            if (result == AVERROR(EAGAIN)) {
197                result = 0;
198                continue;
199            } else if (result == AVERROR(EOF)) {
200                result = 0;
201                break;
202            } else if (result < 0) {
203                av_log(NULL, AV_LOG_ERROR, "Error decoding audio packet\n");
204                return result;
205            }
206
207            if (in_frame->nb_samples != out_frame->nb_samples) {
208                av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different number of samples\n");
209                return AVERROR_UNKNOWN;
210            }
211
212            if (av_channel_layout_compare(&in_frame->ch_layout, &out_frame->ch_layout)) {
213                av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different channel layout\n");
214                return AVERROR_UNKNOWN;
215            }
216
217            if (in_frame->format != out_frame->format) {
218                av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different sample format\n");
219                return AVERROR_UNKNOWN;
220            }
221            out_frame_bytes = out_frame->nb_samples * out_frame->ch_layout.nb_channels * sizeof(uint16_t);
222            if (out_frame_bytes > out_frame->linesize[0]) {
223                av_log(NULL, AV_LOG_ERROR, "Incorrect value of output frame linesize\n");
224                return 1;
225            }
226            memcpy(raw_out + out_offset, out_frame->data[0], out_frame_bytes);
227            out_offset += out_frame_bytes;
228        }
229    }
230
231    if (memcmp(raw_in, raw_out, out_frame_bytes * NUMBER_OF_AUDIO_FRAMES) != 0) {
232        av_log(NULL, AV_LOG_ERROR, "Output differs\n");
233        return 1;
234    }
235
236    av_log(NULL, AV_LOG_INFO, "OK\n");
237
238    av_freep(&raw_in);
239    av_freep(&raw_out);
240    av_packet_free(&enc_pkt);
241    av_frame_free(&in_frame);
242    av_frame_free(&out_frame);
243    return 0;
244}
245
246int main(void)
247{
248    const AVCodec *enc = NULL, *dec = NULL;
249    AVCodecContext *enc_ctx = NULL, *dec_ctx = NULL;
250    const AVChannelLayout channel_layouts[] = { AV_CHANNEL_LAYOUT_STEREO,
251                                                AV_CHANNEL_LAYOUT_5POINT1_BACK,
252                                                AV_CHANNEL_LAYOUT_SURROUND,
253                                                AV_CHANNEL_LAYOUT_STEREO_DOWNMIX };
254    int sample_rates[] = {8000, 44100, 48000, 192000};
255    int cl, sr;
256
257    enc = avcodec_find_encoder(AV_CODEC_ID_FLAC);
258    if (!enc) {
259        av_log(NULL, AV_LOG_ERROR, "Can't find encoder\n");
260        return 1;
261    }
262
263    dec = avcodec_find_decoder(AV_CODEC_ID_FLAC);
264    if (!dec) {
265        av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
266        return 1;
267    }
268
269    for (cl = 0; cl < FF_ARRAY_ELEMS(channel_layouts); cl++) {
270        for (sr = 0; sr < FF_ARRAY_ELEMS(sample_rates); sr++) {
271            if (init_encoder(enc, &enc_ctx, &channel_layouts[cl], sample_rates[sr]) != 0)
272                return 1;
273            if (init_decoder(dec, &dec_ctx, &channel_layouts[cl]) != 0)
274                return 1;
275            if (run_test(enc, dec, enc_ctx, dec_ctx) != 0)
276                return 1;
277            avcodec_free_context(&enc_ctx);
278            avcodec_free_context(&dec_ctx);
279        }
280    }
281
282    return 0;
283}
284