3 * Copyright (c) 2009 Bartlomiej Wolowiec
4 * Copyright (c) 2010 Anssi Hannula
5 * Copyright (c) 2010 Carl Eugen Hoyos
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 * IEC-61937 encapsulation of various formats, used by S/PDIF
27 * @author Bartlomiej Wolowiec
28 * @author Anssi Hannula
29 * @author Carl Eugen Hoyos
33 * Terminology used in specification:
34 * data-burst - IEC61937 frame, contains header and encapsuled frame
35 * burst-preambule - IEC61937 frame header, contains 16-bits words named Pa, Pb, Pc and Pd
36 * burst-payload - encapsuled frame
37 * Pa, Pb - syncword - 0xF872, 0x4E1F
38 * Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12)
39 * and bitstream number (bits 13-15)
40 * data-type - determines type of encapsuled frames
41 * Pd - length code (number of bits or bytes of encapsuled frame - according to data_type)
43 * IEC 61937 frames at normal usage start every specific count of bytes,
44 * dependent from data-type (spaces between packets are filled by zeros)
49 #include "libavcodec/ac3.h"
50 #include "libavcodec/dca.h"
51 #include "libavcodec/aacadtsdec.h"
53 typedef struct IEC61937Context {
54 enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst
55 int length_code; ///< length code in bits or bytes, depending on data type
56 int pkt_offset; ///< data burst repetition period in bytes
57 uint8_t *buffer; ///< allocated buffer, used for swap bytes
58 int buffer_size; ///< size of allocated buffer
60 uint8_t *out_buf; ///< pointer to the outgoing data before byte-swapping
61 int out_bytes; ///< amount of outgoing bytes
63 int use_preamble; ///< preamble enabled (disabled for exactly pre-padded DTS)
64 int extra_bswap; ///< extra bswap for payload (for LE DTS => standard BE DTS)
66 uint8_t *hd_buf; ///< allocated buffer to concatenate hd audio frames
67 int hd_buf_size; ///< size of the hd audio buffer
68 int hd_buf_count; ///< number of frames in the hd audio buffer
69 int hd_buf_filled; ///< amount of bytes in the hd audio buffer
71 /// function, which generates codec dependent header information.
72 /// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary
73 int (*header_info) (AVFormatContext *s, AVPacket *pkt);
77 static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
79 IEC61937Context *ctx = s->priv_data;
80 int bitstream_mode = pkt->data[5] & 0x7;
82 ctx->data_type = IEC61937_AC3 | (bitstream_mode << 8);
83 ctx->pkt_offset = AC3_FRAME_SIZE << 2;
87 static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt)
89 IEC61937Context *ctx = s->priv_data;
90 static const uint8_t eac3_repeat[4] = {6, 3, 2, 1};
93 if ((pkt->data[4] & 0xc0) != 0xc0) /* fscod */
94 repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */
96 ctx->hd_buf = av_fast_realloc(ctx->hd_buf, &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size);
98 return AVERROR(ENOMEM);
100 memcpy(&ctx->hd_buf[ctx->hd_buf_filled], pkt->data, pkt->size);
102 ctx->hd_buf_filled += pkt->size;
103 if (++ctx->hd_buf_count < repeat){
107 ctx->data_type = IEC61937_EAC3;
108 ctx->pkt_offset = 24576;
109 ctx->out_buf = ctx->hd_buf;
110 ctx->out_bytes = ctx->hd_buf_filled;
111 ctx->length_code = ctx->hd_buf_filled;
113 ctx->hd_buf_count = 0;
114 ctx->hd_buf_filled = 0;
118 static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
120 IEC61937Context *ctx = s->priv_data;
121 uint32_t syncword_dts = AV_RB32(pkt->data);
124 switch (syncword_dts) {
125 case DCA_MARKER_RAW_BE:
126 blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
128 case DCA_MARKER_RAW_LE:
129 blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
130 ctx->extra_bswap = 1;
132 case DCA_MARKER_14B_BE:
134 (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2));
136 case DCA_MARKER_14B_LE:
138 (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
139 ctx->extra_bswap = 1;
142 av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%x\n", syncword_dts);
143 return AVERROR_INVALIDDATA;
147 case 512 >> 5: ctx->data_type = IEC61937_DTS1; break;
148 case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
149 case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break;
151 av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n",
153 return AVERROR(ENOSYS);
155 ctx->pkt_offset = blocks << 7;
157 if (ctx->out_bytes == ctx->pkt_offset) {
158 /* The DTS stream fits exactly into the output stream, so skip the
159 * preamble as it would not fit in there. This is the case for dts
160 * discs and dts-in-wav. */
161 ctx->use_preamble = 0;
167 static const enum IEC61937DataType mpeg_data_type[2][3] = {
168 // LAYER1 LAYER2 LAYER3
169 { IEC61937_MPEG2_LAYER1_LSF, IEC61937_MPEG2_LAYER2_LSF, IEC61937_MPEG2_LAYER3_LSF },//MPEG2 LSF
170 { IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, //MPEG1
173 static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt)
175 IEC61937Context *ctx = s->priv_data;
176 int version = (pkt->data[1] >> 3) & 3;
177 int layer = 3 - ((pkt->data[1] >> 1) & 3);
178 int extension = pkt->data[2] & 1;
180 if (layer == 3 || version == 1) {
181 av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n");
182 return AVERROR_INVALIDDATA;
184 av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension);
185 if (version == 2 && extension) {
186 ctx->data_type = IEC61937_MPEG2_EXT;
187 ctx->pkt_offset = 4608;
189 ctx->data_type = mpeg_data_type [version & 1][layer];
190 ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer];
192 // TODO Data type dependant info (normal/karaoke, dynamic range control)
196 static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt)
198 IEC61937Context *ctx = s->priv_data;
199 AACADTSHeaderInfo hdr;
203 init_get_bits(&gbc, pkt->data, AAC_ADTS_HEADER_SIZE * 8);
204 ret = ff_aac_parse_header(&gbc, &hdr);
206 av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n");
207 return AVERROR_INVALIDDATA;
210 ctx->pkt_offset = hdr.samples << 2;
211 switch (hdr.num_aac_frames) {
213 ctx->data_type = IEC61937_MPEG2_AAC;
216 ctx->data_type = IEC61937_MPEG2_AAC_LSF_2048;
219 ctx->data_type = IEC61937_MPEG2_AAC_LSF_4096;
222 av_log(s, AV_LOG_ERROR, "%i samples in AAC frame not supported\n",
224 return AVERROR(EINVAL);
226 //TODO Data type dependent info (LC profile/SBR)
232 * It seems Dolby TrueHD frames have to be encapsulated in MAT frames before
233 * they can be encapsulated in IEC 61937.
234 * Here we encapsulate 24 TrueHD frames in a single MAT frame, padding them
235 * to achieve constant rate.
236 * The actual format of a MAT frame is unknown, but the below seems to work.
237 * However, it seems it is not actually necessary for the 24 TrueHD frames to
238 * be in an exact alignment with the MAT frame.
240 #define MAT_FRAME_SIZE 61424
241 #define TRUEHD_FRAME_OFFSET 2560
242 #define MAT_MIDDLE_CODE_OFFSET -4
244 static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt)
246 IEC61937Context *ctx = s->priv_data;
247 int mat_code_length = 0;
248 const char mat_end_code[16] = { 0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11 };
250 if (!ctx->hd_buf_count) {
251 const char mat_start_code[20] = { 0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83, 0x49, 0x80, 0x77, 0xE0 };
252 mat_code_length = sizeof(mat_start_code) + BURST_HEADER_SIZE;
253 memcpy(ctx->hd_buf, mat_start_code, sizeof(mat_start_code));
255 } else if (ctx->hd_buf_count == 12) {
256 const char mat_middle_code[12] = { 0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0 };
257 mat_code_length = sizeof(mat_middle_code) + MAT_MIDDLE_CODE_OFFSET;
258 memcpy(&ctx->hd_buf[12 * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + MAT_MIDDLE_CODE_OFFSET],
259 mat_middle_code, sizeof(mat_middle_code));
262 if (pkt->size > TRUEHD_FRAME_OFFSET - mat_code_length) {
263 /* if such frames exist, we'd need some more complex logic to
264 * distribute the TrueHD frames in the MAT frame */
265 av_log(s, AV_LOG_ERROR, "TrueHD frame too big, %d bytes\n", pkt->size);
266 av_log_ask_for_sample(s, NULL);
267 return AVERROR_INVALIDDATA;
270 memcpy(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length],
271 pkt->data, pkt->size);
272 memset(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length + pkt->size],
273 0, TRUEHD_FRAME_OFFSET - pkt->size - mat_code_length);
275 if (++ctx->hd_buf_count < 24){
279 memcpy(&ctx->hd_buf[MAT_FRAME_SIZE - sizeof(mat_end_code)], mat_end_code, sizeof(mat_end_code));
280 ctx->hd_buf_count = 0;
282 ctx->data_type = IEC61937_TRUEHD;
283 ctx->pkt_offset = 61440;
284 ctx->out_buf = ctx->hd_buf;
285 ctx->out_bytes = MAT_FRAME_SIZE;
286 ctx->length_code = MAT_FRAME_SIZE;
290 static int spdif_write_header(AVFormatContext *s)
292 IEC61937Context *ctx = s->priv_data;
294 switch (s->streams[0]->codec->codec_id) {
296 ctx->header_info = spdif_header_ac3;
299 ctx->header_info = spdif_header_eac3;
304 ctx->header_info = spdif_header_mpeg;
307 ctx->header_info = spdif_header_dts;
310 ctx->header_info = spdif_header_aac;
312 case CODEC_ID_TRUEHD:
313 ctx->header_info = spdif_header_truehd;
314 ctx->hd_buf = av_malloc(MAT_FRAME_SIZE);
316 return AVERROR(ENOMEM);
319 av_log(s, AV_LOG_ERROR, "codec not supported\n");
320 return AVERROR_PATCHWELCOME;
325 static int spdif_write_trailer(AVFormatContext *s)
327 IEC61937Context *ctx = s->priv_data;
328 av_freep(&ctx->buffer);
329 av_freep(&ctx->hd_buf);
333 static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt)
335 IEC61937Context *ctx = s->priv_data;
338 ctx->out_buf = pkt->data;
339 ctx->out_bytes = pkt->size;
340 ctx->length_code = FFALIGN(pkt->size, 2) << 3;
341 ctx->use_preamble = 1;
342 ctx->extra_bswap = 0;
344 ret = ctx->header_info(s, pkt);
347 if (!ctx->pkt_offset)
350 padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1;
352 av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
353 return AVERROR(EINVAL);
356 if (ctx->use_preamble) {
357 put_le16(s->pb, SYNCWORD1); //Pa
358 put_le16(s->pb, SYNCWORD2); //Pb
359 put_le16(s->pb, ctx->data_type); //Pc
360 put_le16(s->pb, ctx->length_code);//Pd
363 if (HAVE_BIGENDIAN ^ ctx->extra_bswap) {
364 put_buffer(s->pb, ctx->out_buf, ctx->out_bytes & ~1);
366 av_fast_malloc(&ctx->buffer, &ctx->buffer_size, ctx->out_bytes + FF_INPUT_BUFFER_PADDING_SIZE);
368 return AVERROR(ENOMEM);
369 ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1);
370 put_buffer(s->pb, ctx->buffer, ctx->out_bytes & ~1);
373 if (ctx->out_bytes & 1)
374 put_be16(s->pb, ctx->out_buf[ctx->out_bytes - 1]);
376 put_nbyte(s->pb, 0, padding);
378 av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
379 ctx->data_type, ctx->out_bytes, ctx->pkt_offset);
381 put_flush_packet(s->pb);
385 AVOutputFormat spdif_muxer = {
387 NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"),
390 sizeof(IEC61937Context),