3 * Copyright (c) 2015 Rodger Combs
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include <interface/mmal/mmal.h>
29 #include <interface/mmal/mmal_parameters_video.h>
30 #include <interface/mmal/util/mmal_util.h>
31 #include <interface/mmal/util/mmal_util_params.h>
32 #include <interface/mmal/util/mmal_default_components.h>
33 #include <interface/mmal/vc/mmal_vc_api.h>
37 #include "libavutil/atomic.h"
38 #include "libavutil/avassert.h"
39 #include "libavutil/buffer.h"
40 #include "libavutil/common.h"
41 #include "libavutil/imgutils.h"
42 #include "libavutil/opt.h"
43 #include "libavutil/log.h"
45 typedef struct FFBufferEntry {
51 struct FFBufferEntry *next;
54 // MMAL_POOL_T destroys all of its MMAL_BUFFER_HEADER_Ts. If we want correct
55 // refcounting for AVFrames, we can free the MMAL_POOL_T only after all AVFrames
56 // have been unreferenced.
57 typedef struct FFPoolRef {
58 volatile int refcount;
62 typedef struct FFBufferRef {
63 MMAL_BUFFER_HEADER_T *buffer;
67 typedef struct MMALDecodeContext {
70 int extra_decoder_buffers;
72 MMAL_COMPONENT_T *decoder;
73 MMAL_QUEUE_T *queue_decoded_frames;
77 // Waiting input packets. Because the libavcodec API requires decoding and
78 // returning packets in lockstep, it can happen that queue_decoded_frames
79 // contains almost all surfaces - then the decoder input queue can quickly
80 // fill up and won't accept new input either. Without consuming input, the
81 // libavcodec API can't return new frames, and we have a logical deadlock.
82 // This is avoided by queuing such buffers here.
83 FFBufferEntry *waiting_buffers, *waiting_buffers_tail;
86 volatile int packets_buffered;
87 int64_t frames_output;
95 // Assume decoder is guaranteed to produce output after at least this many
96 // packets (where each packet contains 1 frame).
97 #define MAX_DELAYED_FRAMES 16
99 static void ffmmal_poolref_unref(FFPoolRef *ref)
101 if (ref && avpriv_atomic_int_add_and_fetch(&ref->refcount, -1) == 0) {
102 mmal_pool_destroy(ref->pool);
107 static void ffmmal_release_frame(void *opaque, uint8_t *data)
109 FFBufferRef *ref = (void *)data;
111 mmal_buffer_header_release(ref->buffer);
112 ffmmal_poolref_unref(ref->pool);
117 // Setup frame with a new reference to buffer. The buffer must have been
118 // allocated from the given pool.
119 static int ffmmal_set_ref(AVFrame *frame, FFPoolRef *pool,
120 MMAL_BUFFER_HEADER_T *buffer)
122 FFBufferRef *ref = av_mallocz(sizeof(*ref));
124 return AVERROR(ENOMEM);
127 ref->buffer = buffer;
129 frame->buf[0] = av_buffer_create((void *)ref, sizeof(*ref),
130 ffmmal_release_frame, NULL,
131 AV_BUFFER_FLAG_READONLY);
132 if (!frame->buf[0]) {
134 return AVERROR(ENOMEM);
137 avpriv_atomic_int_add_and_fetch(&ref->pool->refcount, 1);
138 mmal_buffer_header_acquire(buffer);
140 frame->format = AV_PIX_FMT_MMAL;
141 frame->data[3] = (uint8_t *)ref->buffer;
145 static void ffmmal_stop_decoder(AVCodecContext *avctx)
147 MMALDecodeContext *ctx = avctx->priv_data;
148 MMAL_COMPONENT_T *decoder = ctx->decoder;
149 MMAL_BUFFER_HEADER_T *buffer;
151 mmal_port_disable(decoder->input[0]);
152 mmal_port_disable(decoder->output[0]);
153 mmal_port_disable(decoder->control);
155 mmal_port_flush(decoder->input[0]);
156 mmal_port_flush(decoder->output[0]);
157 mmal_port_flush(decoder->control);
159 while ((buffer = mmal_queue_get(ctx->queue_decoded_frames)))
160 mmal_buffer_header_release(buffer);
162 while (ctx->waiting_buffers) {
163 FFBufferEntry *buffer = ctx->waiting_buffers;
165 ctx->waiting_buffers = buffer->next;
167 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
168 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, -1);
170 av_buffer_unref(&buffer->ref);
173 ctx->waiting_buffers_tail = NULL;
175 av_assert0(avpriv_atomic_int_get(&ctx->packets_buffered) == 0);
177 ctx->frames_output = ctx->eos_received = ctx->eos_sent = ctx->packets_sent = ctx->extradata_sent = 0;
180 static av_cold int ffmmal_close_decoder(AVCodecContext *avctx)
182 MMALDecodeContext *ctx = avctx->priv_data;
185 ffmmal_stop_decoder(avctx);
187 mmal_component_destroy(ctx->decoder);
189 mmal_queue_destroy(ctx->queue_decoded_frames);
190 mmal_pool_destroy(ctx->pool_in);
191 ffmmal_poolref_unref(ctx->pool_out);
198 static void input_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
200 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
201 MMALDecodeContext *ctx = avctx->priv_data;
204 FFBufferEntry *entry = buffer->user_data;
205 av_buffer_unref(&entry->ref);
206 if (entry->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
207 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, -1);
210 mmal_buffer_header_release(buffer);
213 static void output_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
215 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
216 MMALDecodeContext *ctx = avctx->priv_data;
218 mmal_queue_put(ctx->queue_decoded_frames, buffer);
221 static void control_port_cb(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
223 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
224 MMAL_STATUS_T status;
226 if (buffer->cmd == MMAL_EVENT_ERROR) {
227 status = *(uint32_t *)buffer->data;
228 av_log(avctx, AV_LOG_ERROR, "MMAL error %d on control port\n", (int)status);
231 av_get_codec_tag_string(s, sizeof(s), buffer->cmd);
232 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on control port\n", s);
235 mmal_buffer_header_release(buffer);
238 // Feed free output buffers to the decoder.
239 static int ffmmal_fill_output_port(AVCodecContext *avctx)
241 MMALDecodeContext *ctx = avctx->priv_data;
242 MMAL_BUFFER_HEADER_T *buffer;
243 MMAL_STATUS_T status;
246 return AVERROR_UNKNOWN; // format change code failed with OOM previously
248 while ((buffer = mmal_queue_get(ctx->pool_out->pool->queue))) {
249 if ((status = mmal_port_send_buffer(ctx->decoder->output[0], buffer))) {
250 mmal_buffer_header_release(buffer);
251 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending output buffer.\n", (int)status);
252 return AVERROR_UNKNOWN;
259 static enum AVColorSpace ffmmal_csp_to_av_csp(MMAL_FOURCC_T fourcc)
262 case MMAL_COLOR_SPACE_BT470_2_BG:
263 case MMAL_COLOR_SPACE_BT470_2_M:
264 case MMAL_COLOR_SPACE_ITUR_BT601: return AVCOL_SPC_BT470BG;
265 case MMAL_COLOR_SPACE_ITUR_BT709: return AVCOL_SPC_BT709;
266 case MMAL_COLOR_SPACE_FCC: return AVCOL_SPC_FCC;
267 case MMAL_COLOR_SPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M;
268 default: return AVCOL_SPC_UNSPECIFIED;
272 static int ffmal_update_format(AVCodecContext *avctx)
274 MMALDecodeContext *ctx = avctx->priv_data;
275 MMAL_STATUS_T status;
277 MMAL_COMPONENT_T *decoder = ctx->decoder;
278 MMAL_ES_FORMAT_T *format_out = decoder->output[0]->format;
279 MMAL_PARAMETER_VIDEO_INTERLACE_TYPE_T interlace_type;
281 ffmmal_poolref_unref(ctx->pool_out);
282 if (!(ctx->pool_out = av_mallocz(sizeof(*ctx->pool_out)))) {
283 ret = AVERROR(ENOMEM);
286 ctx->pool_out->refcount = 1;
291 if ((status = mmal_port_parameter_set_uint32(decoder->output[0], MMAL_PARAMETER_EXTRA_BUFFERS, ctx->extra_buffers)))
294 if ((status = mmal_port_parameter_set_boolean(decoder->output[0], MMAL_PARAMETER_VIDEO_INTERPOLATE_TIMESTAMPS, 0)))
297 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
298 format_out->encoding = MMAL_ENCODING_OPAQUE;
300 format_out->encoding_variant = format_out->encoding = MMAL_ENCODING_I420;
303 if ((status = mmal_port_format_commit(decoder->output[0])))
306 interlace_type.hdr.id = MMAL_PARAMETER_VIDEO_INTERLACE_TYPE;
307 interlace_type.hdr.size = sizeof(MMAL_PARAMETER_VIDEO_INTERLACE_TYPE_T);
308 status = mmal_port_parameter_get(decoder->output[0], &interlace_type.hdr);
309 if (status != MMAL_SUCCESS) {
310 av_log(avctx, AV_LOG_ERROR, "Cannot read MMAL interlace information!\n");
312 ctx->interlaced_frame = (interlace_type.eMode != MMAL_InterlaceProgressive);
313 ctx->top_field_first = (interlace_type.eMode == MMAL_InterlaceFieldsInterleavedUpperFirst);
316 if ((ret = ff_set_dimensions(avctx, format_out->es->video.crop.x + format_out->es->video.crop.width,
317 format_out->es->video.crop.y + format_out->es->video.crop.height)) < 0)
320 if (format_out->es->video.par.num && format_out->es->video.par.den) {
321 avctx->sample_aspect_ratio.num = format_out->es->video.par.num;
322 avctx->sample_aspect_ratio.den = format_out->es->video.par.den;
324 if (format_out->es->video.frame_rate.num && format_out->es->video.frame_rate.den) {
325 avctx->framerate.num = format_out->es->video.frame_rate.num;
326 avctx->framerate.den = format_out->es->video.frame_rate.den;
329 avctx->colorspace = ffmmal_csp_to_av_csp(format_out->es->video.color_space);
331 decoder->output[0]->buffer_size =
332 FFMAX(decoder->output[0]->buffer_size_min, decoder->output[0]->buffer_size_recommended);
333 decoder->output[0]->buffer_num =
334 FFMAX(decoder->output[0]->buffer_num_min, decoder->output[0]->buffer_num_recommended) + ctx->extra_buffers;
335 ctx->pool_out->pool = mmal_pool_create(decoder->output[0]->buffer_num,
336 decoder->output[0]->buffer_size);
337 if (!ctx->pool_out->pool) {
338 ret = AVERROR(ENOMEM);
345 return ret < 0 ? ret : AVERROR_UNKNOWN;
348 static av_cold int ffmmal_init_decoder(AVCodecContext *avctx)
350 MMALDecodeContext *ctx = avctx->priv_data;
351 MMAL_STATUS_T status;
352 MMAL_ES_FORMAT_T *format_in;
353 MMAL_COMPONENT_T *decoder;
359 if (mmal_vc_init()) {
360 av_log(avctx, AV_LOG_ERROR, "Cannot initialize MMAL VC driver!\n");
361 return AVERROR(ENOSYS);
364 if ((ret = ff_get_format(avctx, avctx->codec->pix_fmts)) < 0)
367 avctx->pix_fmt = ret;
369 if ((status = mmal_component_create(MMAL_COMPONENT_DEFAULT_VIDEO_DECODER, &ctx->decoder)))
372 decoder = ctx->decoder;
374 format_in = decoder->input[0]->format;
375 format_in->type = MMAL_ES_TYPE_VIDEO;
376 switch (avctx->codec_id) {
377 case AV_CODEC_ID_MPEG2VIDEO:
378 format_in->encoding = MMAL_ENCODING_MP2V;
380 case AV_CODEC_ID_MPEG4:
381 format_in->encoding = MMAL_ENCODING_MP4V;
383 case AV_CODEC_ID_VC1:
384 format_in->encoding = MMAL_ENCODING_WVC1;
386 case AV_CODEC_ID_H264:
388 format_in->encoding = MMAL_ENCODING_H264;
391 format_in->es->video.width = FFALIGN(avctx->width, 32);
392 format_in->es->video.height = FFALIGN(avctx->height, 16);
393 format_in->es->video.crop.width = avctx->width;
394 format_in->es->video.crop.height = avctx->height;
395 format_in->es->video.frame_rate.num = 24000;
396 format_in->es->video.frame_rate.den = 1001;
397 format_in->es->video.par.num = avctx->sample_aspect_ratio.num;
398 format_in->es->video.par.den = avctx->sample_aspect_ratio.den;
399 format_in->flags = MMAL_ES_FORMAT_FLAG_FRAMED;
401 av_get_codec_tag_string(tmp, sizeof(tmp), format_in->encoding);
402 av_log(avctx, AV_LOG_DEBUG, "Using MMAL %s encoding.\n", tmp);
404 #if HAVE_MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS
405 if (mmal_port_parameter_set_uint32(decoder->input[0], MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS,
406 -1 - ctx->extra_decoder_buffers)) {
407 av_log(avctx, AV_LOG_WARNING, "Could not set input buffering limit.\n");
411 if ((status = mmal_port_format_commit(decoder->input[0])))
414 decoder->input[0]->buffer_num =
415 FFMAX(decoder->input[0]->buffer_num_min, 20);
416 decoder->input[0]->buffer_size =
417 FFMAX(decoder->input[0]->buffer_size_min, 512 * 1024);
418 ctx->pool_in = mmal_pool_create(decoder->input[0]->buffer_num, 0);
420 ret = AVERROR(ENOMEM);
424 if ((ret = ffmal_update_format(avctx)) < 0)
427 ctx->queue_decoded_frames = mmal_queue_create();
428 if (!ctx->queue_decoded_frames)
431 decoder->input[0]->userdata = (void*)avctx;
432 decoder->output[0]->userdata = (void*)avctx;
433 decoder->control->userdata = (void*)avctx;
435 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
437 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
439 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
442 if ((status = mmal_component_enable(decoder)))
448 ffmmal_close_decoder(avctx);
449 return ret < 0 ? ret : AVERROR_UNKNOWN;
452 static void ffmmal_flush(AVCodecContext *avctx)
454 MMALDecodeContext *ctx = avctx->priv_data;
455 MMAL_COMPONENT_T *decoder = ctx->decoder;
456 MMAL_STATUS_T status;
458 ffmmal_stop_decoder(avctx);
460 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
462 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
464 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
470 av_log(avctx, AV_LOG_ERROR, "MMAL flush error: %i\n", (int)status);
473 // Split packets and add them to the waiting_buffers list. We don't queue them
474 // immediately, because it can happen that the decoder is temporarily blocked
475 // (due to us not reading/returning enough output buffers) and won't accept
476 // new input. (This wouldn't be an issue if MMAL input buffers always were
477 // complete frames - then the input buffer just would have to be big enough.)
478 // If is_extradata is set, send it as MMAL_BUFFER_HEADER_FLAG_CONFIG.
479 static int ffmmal_add_packet(AVCodecContext *avctx, AVPacket *avpkt,
482 MMALDecodeContext *ctx = avctx->priv_data;
483 AVBufferRef *buf = NULL;
485 uint8_t *data = (uint8_t *)"";
491 buf = av_buffer_ref(avpkt->buf);
495 buf = av_buffer_alloc(avpkt->size);
497 memcpy(buf->data, avpkt->data, avpkt->size);
503 ret = AVERROR(ENOMEM);
511 if (!ctx->packets_sent) {
512 // Short-cut the flush logic to avoid upsetting MMAL.
514 ctx->eos_received = 1;
522 FFBufferEntry *buffer = av_mallocz(sizeof(*buffer));
524 ret = AVERROR(ENOMEM);
529 buffer->length = FFMIN(size, ctx->decoder->input[0]->buffer_size);
532 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_CONFIG;
535 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_START;
537 data += buffer->length;
538 size -= buffer->length;
540 buffer->pts = avpkt->pts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->pts;
541 buffer->dts = avpkt->dts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->dts;
544 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_END;
545 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, 1);
548 if (!buffer->length) {
549 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_EOS;
554 buffer->ref = av_buffer_ref(buf);
557 ret = AVERROR(ENOMEM);
562 // Insert at end of the list
563 if (!ctx->waiting_buffers)
564 ctx->waiting_buffers = buffer;
565 if (ctx->waiting_buffers_tail)
566 ctx->waiting_buffers_tail->next = buffer;
567 ctx->waiting_buffers_tail = buffer;
571 av_buffer_unref(&buf);
575 // Move prepared/split packets from waiting_buffers to the MMAL decoder.
576 static int ffmmal_fill_input_port(AVCodecContext *avctx)
578 MMALDecodeContext *ctx = avctx->priv_data;
580 while (ctx->waiting_buffers) {
581 MMAL_BUFFER_HEADER_T *mbuffer;
582 FFBufferEntry *buffer;
583 MMAL_STATUS_T status;
585 mbuffer = mmal_queue_get(ctx->pool_in->queue);
589 buffer = ctx->waiting_buffers;
591 mmal_buffer_header_reset(mbuffer);
593 mbuffer->pts = buffer->pts;
594 mbuffer->dts = buffer->dts;
595 mbuffer->flags = buffer->flags;
596 mbuffer->data = buffer->data;
597 mbuffer->length = buffer->length;
598 mbuffer->user_data = buffer;
599 mbuffer->alloc_size = ctx->decoder->input[0]->buffer_size;
601 // Remove from start of the list
602 ctx->waiting_buffers = buffer->next;
603 if (ctx->waiting_buffers_tail == buffer)
604 ctx->waiting_buffers_tail = NULL;
606 if ((status = mmal_port_send_buffer(ctx->decoder->input[0], mbuffer))) {
607 mmal_buffer_header_release(mbuffer);
608 av_buffer_unref(&buffer->ref);
609 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
610 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, -1);
615 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending input\n", (int)status);
616 return AVERROR_UNKNOWN;
623 static int ffmal_copy_frame(AVCodecContext *avctx, AVFrame *frame,
624 MMAL_BUFFER_HEADER_T *buffer)
626 MMALDecodeContext *ctx = avctx->priv_data;
629 frame->interlaced_frame = ctx->interlaced_frame;
630 frame->top_field_first = ctx->top_field_first;
632 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
634 return AVERROR_UNKNOWN; // format change code failed with OOM previously
636 if ((ret = ff_decode_frame_props(avctx, frame)) < 0)
639 if ((ret = ffmmal_set_ref(frame, ctx->pool_out, buffer)) < 0)
642 int w = FFALIGN(avctx->width, 32);
643 int h = FFALIGN(avctx->height, 16);
647 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
650 av_image_fill_arrays(src, linesize,
651 buffer->data + buffer->type->video.offset[0],
652 avctx->pix_fmt, w, h, 1);
653 av_image_copy(frame->data, frame->linesize, src, linesize,
654 avctx->pix_fmt, avctx->width, avctx->height);
657 frame->pkt_pts = buffer->pts == MMAL_TIME_UNKNOWN ? AV_NOPTS_VALUE : buffer->pts;
658 frame->pkt_dts = AV_NOPTS_VALUE;
664 // Fetch a decoded buffer and place it into the frame parameter.
665 static int ffmmal_read_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
667 MMALDecodeContext *ctx = avctx->priv_data;
668 MMAL_BUFFER_HEADER_T *buffer = NULL;
669 MMAL_STATUS_T status = 0;
672 if (ctx->eos_received)
676 // To ensure decoding in lockstep with a constant delay between fed packets
677 // and output frames, we always wait until an output buffer is available.
678 // Except during start we don't know after how many input packets the decoder
679 // is going to return the first buffer, and we can't distinguish decoder
680 // being busy from decoder waiting for input. So just poll at the start and
681 // keep feeding new data to the buffer.
682 // We are pretty sure the decoder will produce output if we sent more input
683 // frames than what a H.264 decoder could logically delay. This avoids too
684 // excessive buffering.
685 // We also wait if we sent eos, but didn't receive it yet (think of decoding
686 // stream with a very low number of frames).
687 if (avpriv_atomic_int_get(&ctx->packets_buffered) > MAX_DELAYED_FRAMES ||
688 (ctx->packets_sent && ctx->eos_sent)) {
689 // MMAL will ignore broken input packets, which means the frame we
690 // expect here may never arrive. Dealing with this correctly is
691 // complicated, so here's a hack to avoid that it freezes forever
692 // in this unlikely situation.
693 buffer = mmal_queue_timedwait(ctx->queue_decoded_frames, 100);
695 av_log(avctx, AV_LOG_ERROR, "Did not get output frame from MMAL.\n");
696 ret = AVERROR_UNKNOWN;
700 buffer = mmal_queue_get(ctx->queue_decoded_frames);
705 ctx->eos_received |= !!(buffer->flags & MMAL_BUFFER_HEADER_FLAG_EOS);
706 if (ctx->eos_received)
709 if (buffer->cmd == MMAL_EVENT_FORMAT_CHANGED) {
710 MMAL_COMPONENT_T *decoder = ctx->decoder;
711 MMAL_EVENT_FORMAT_CHANGED_T *ev = mmal_event_format_changed_get(buffer);
712 MMAL_BUFFER_HEADER_T *stale_buffer;
714 av_log(avctx, AV_LOG_INFO, "Changing output format.\n");
716 if ((status = mmal_port_disable(decoder->output[0])))
719 while ((stale_buffer = mmal_queue_get(ctx->queue_decoded_frames)))
720 mmal_buffer_header_release(stale_buffer);
722 mmal_format_copy(decoder->output[0]->format, ev->format);
724 if ((ret = ffmal_update_format(avctx)) < 0)
727 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
730 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
733 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
736 mmal_buffer_header_release(buffer);
738 } else if (buffer->cmd) {
740 av_get_codec_tag_string(s, sizeof(s), buffer->cmd);
741 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on output port\n", s);
743 } else if (buffer->length == 0) {
744 // Unused output buffer that got drained after format change.
745 mmal_buffer_header_release(buffer);
749 ctx->frames_output++;
751 if ((ret = ffmal_copy_frame(avctx, frame, buffer)) < 0)
760 mmal_buffer_header_release(buffer);
761 if (status && ret >= 0)
762 ret = AVERROR_UNKNOWN;
766 static int ffmmal_decode(AVCodecContext *avctx, void *data, int *got_frame,
769 MMALDecodeContext *ctx = avctx->priv_data;
770 AVFrame *frame = data;
773 if (avctx->extradata_size && !ctx->extradata_sent) {
775 av_init_packet(&pkt);
776 pkt.data = avctx->extradata;
777 pkt.size = avctx->extradata_size;
778 ctx->extradata_sent = 1;
779 if ((ret = ffmmal_add_packet(avctx, &pkt, 1)) < 0)
783 if ((ret = ffmmal_add_packet(avctx, avpkt, 0)) < 0)
786 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
789 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
792 if ((ret = ffmmal_read_frame(avctx, frame, got_frame)) < 0)
795 // ffmmal_read_frame() can block for a while. Since the decoder is
796 // asynchronous, it's a good idea to fill the ports again.
798 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
801 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
807 AVHWAccel ff_h264_mmal_hwaccel = {
809 .type = AVMEDIA_TYPE_VIDEO,
810 .id = AV_CODEC_ID_H264,
811 .pix_fmt = AV_PIX_FMT_MMAL,
814 AVHWAccel ff_mpeg2_mmal_hwaccel = {
815 .name = "mpeg2_mmal",
816 .type = AVMEDIA_TYPE_VIDEO,
817 .id = AV_CODEC_ID_MPEG2VIDEO,
818 .pix_fmt = AV_PIX_FMT_MMAL,
821 AVHWAccel ff_mpeg4_mmal_hwaccel = {
822 .name = "mpeg4_mmal",
823 .type = AVMEDIA_TYPE_VIDEO,
824 .id = AV_CODEC_ID_MPEG4,
825 .pix_fmt = AV_PIX_FMT_MMAL,
828 AVHWAccel ff_vc1_mmal_hwaccel = {
830 .type = AVMEDIA_TYPE_VIDEO,
831 .id = AV_CODEC_ID_VC1,
832 .pix_fmt = AV_PIX_FMT_MMAL,
835 static const AVOption options[]={
836 {"extra_buffers", "extra buffers", offsetof(MMALDecodeContext, extra_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
837 {"extra_decoder_buffers", "extra MMAL internal buffered frames", offsetof(MMALDecodeContext, extra_decoder_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
841 #define FFMMAL_DEC_CLASS(NAME) \
842 static const AVClass ffmmal_##NAME##_dec_class = { \
843 .class_name = "mmal_" #NAME "_dec", \
845 .version = LIBAVUTIL_VERSION_INT, \
848 #define FFMMAL_DEC(NAME, ID) \
849 FFMMAL_DEC_CLASS(NAME) \
850 AVCodec ff_##NAME##_mmal_decoder = { \
851 .name = #NAME "_mmal", \
852 .long_name = NULL_IF_CONFIG_SMALL(#NAME " (mmal)"), \
853 .type = AVMEDIA_TYPE_VIDEO, \
855 .priv_data_size = sizeof(MMALDecodeContext), \
856 .init = ffmmal_init_decoder, \
857 .close = ffmmal_close_decoder, \
858 .decode = ffmmal_decode, \
859 .flush = ffmmal_flush, \
860 .priv_class = &ffmmal_##NAME##_dec_class, \
861 .capabilities = AV_CODEC_CAP_DELAY, \
862 .caps_internal = FF_CODEC_CAP_SETS_PKT_DTS, \
863 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL, \
864 AV_PIX_FMT_YUV420P, \
868 FFMMAL_DEC(h264, AV_CODEC_ID_H264)
869 FFMMAL_DEC(mpeg2, AV_CODEC_ID_MPEG2VIDEO)
870 FFMMAL_DEC(mpeg4, AV_CODEC_ID_MPEG4)
871 FFMMAL_DEC(vc1, AV_CODEC_ID_VC1)